diff --git a/Graphs/gLineChart.cpp b/Graphs/gLineChart.cpp
index 79bde685..f39aca63 100644
--- a/Graphs/gLineChart.cpp
+++ b/Graphs/gLineChart.cpp
@@ -249,9 +249,11 @@ void gLineChart::Plot(gGraphWindow & w,float scrx,float scry)
 
                     vertarray[vertcnt++]=start_px+px;
                     vertarray[vertcnt++]=start_py+py;
-                    #if defined(EXTRA_ASSERTS)
-                    assert(vertcnt<maxverts);
-                    #endif
+
+                    if (vertcnt>=maxverts) break;
+                    //#if defined(EXTRA_ASSERTS)
+                    //assert(vertcnt<maxverts);
+                    //#endif
                 }
                 lastpx=start_px+px;
                 lastpy=start_py+py;
@@ -288,9 +290,10 @@ void gLineChart::Plot(gGraphWindow & w,float scrx,float scry)
                 vertarray[vertcnt++]=start_px+i+1;
                 vertarray[vertcnt++]=start_py+m_drawlist[i].y();
 
-                #if defined(EXTRA_ASSERTS)
-                assert(vertcnt<maxverts);
-                #endif
+                if (vertcnt>=maxverts) break;
+                //#if defined(EXTRA_ASSERTS)
+                //assert(vertcnt<maxverts);
+                //#endif
             }
         }
     }
diff --git a/Graphs/gLineOverlay.cpp b/Graphs/gLineOverlay.cpp
index d5d2255a..8fb1147a 100644
--- a/Graphs/gLineOverlay.cpp
+++ b/Graphs/gLineOverlay.cpp
@@ -133,11 +133,13 @@ void gLineOverlayBar::Plot(gGraphWindow & w,float scrx,float scry)
 
                 }
             }
+            if ((vertcnt>=maxverts) || (quadcnt>=maxverts) || (pointcnt>=maxverts)) break;
         }
     }
-    assert (vertcnt<maxverts);
-    assert (quadcnt<maxverts);
-    assert (pointcnt<maxverts);
+
+    //assert (vertcnt<maxverts);
+    //assert (quadcnt<maxverts);
+    //assert (pointcnt<maxverts);
     glColor4ub(col.red(),col.green(),col.blue(),col.alpha());
     if (quadcnt>0) {
         glEnableClientState(GL_VERTEX_ARRAY);
diff --git a/Graphs/gXAxis.cpp b/Graphs/gXAxis.cpp
index 9c6506de..17ae1d51 100644
--- a/Graphs/gXAxis.cpp
+++ b/Graphs/gXAxis.cpp
@@ -5,6 +5,7 @@
 *********************************************************************/
 
 #include <math.h>
+#include <QDebug>
 #include "gXAxis.h"
 
 gXAxis::gXAxis(QColor col)
@@ -53,7 +54,10 @@ void gXAxis::Plot(gGraphWindow & w,float scrx,float scry)
     }
     float x,y;
     GetTextExtent(fd,x,y);
-    assert(x>0);
+    if (x<=0) {
+        qWarning() << "gXAxis::Plot() x<=0";
+        return;
+    }
 
     double max_ticks=(x+25.0)/width; // y+50 for rotated text
     double jj=1/max_ticks;
@@ -92,7 +96,8 @@ void gXAxis::Plot(gGraphWindow & w,float scrx,float scry)
         //if (min_tick>10) min_tick=10;
     }
     if (min_tick<=0) {
-        assert(min_tick>0);
+        qWarning() << "gXAxis::Plot() min_tick<=0 :(";
+        return;
     }
 
     double st3=st;
@@ -115,7 +120,10 @@ void gXAxis::Plot(gGraphWindow & w,float scrx,float scry)
             vertarray[vertcnt++]=py;
             vertarray[vertcnt++]=px;
             vertarray[vertcnt++]=py-4;
-            assert(vertcnt<maxverts);
+            if (vertcnt>maxverts) {
+                qWarning() << "gXAxis::Plot() maxverts exceeded trying to draw minor ticks";
+                return;
+            }
         }
     }
 
@@ -159,7 +167,10 @@ void gXAxis::Plot(gGraphWindow & w,float scrx,float scry)
             vertarray[vertcnt++]=py;
             vertarray[vertcnt++]=px;
             vertarray[vertcnt++]=py-6;
-            assert(vertcnt<maxverts);
+            if (vertcnt>maxverts) {
+                qWarning() << "gXAxis::Plot() maxverts exceeded trying to draw Major ticks";
+                return;
+            }
         }
 
         GetTextExtent(fd,x,y);
@@ -174,7 +185,10 @@ void gXAxis::Plot(gGraphWindow & w,float scrx,float scry)
 
     }
 // Draw the little ticks.
-    assert(vertcnt<maxverts);
+    if (vertcnt>=maxverts) {
+        qWarning() << "maxverts exceeded in gYAxis::Plot()";
+        return;
+    }
 
     glLineWidth(1);
     glColor3f(0,0,0);
diff --git a/Graphs/gYAxis.cpp b/Graphs/gYAxis.cpp
index 8a90cc89..4d8b1851 100644
--- a/Graphs/gYAxis.cpp
+++ b/Graphs/gYAxis.cpp
@@ -5,6 +5,7 @@
 *********************************************************************/
 
 #include <math.h>
+#include <QDebug>
 #include "gYAxis.h"
 
 gYAxis::gYAxis(QColor col)
@@ -95,8 +96,6 @@ void gYAxis::Plot(gGraphWindow &w,float scrx,float scry)
         if (x>labelW) labelW=x;
         h=start_py+ty;
         DrawText(fd,start_px-12-x,scry-(h-(y/2.0)),0);
-        //glColor3ub(0,0,0);
-        //w.renderText(start_px-15-x, scry-(h - (y / 2)),fd);
 
         vertarray[vertcnt++]=start_px-4;
         vertarray[vertcnt++]=h;
@@ -111,7 +110,10 @@ void gYAxis::Plot(gGraphWindow &w,float scrx,float scry)
             glEnd();
         }
     }
-    assert(vertcnt<maxverts);
+    if (vertcnt>=maxverts) {
+        qDebug() << "maxverts exceeded in gYAxis::Plot()";
+        return;
+    }
 
     // Draw the little ticks.
     glLineWidth(1);
diff --git a/Graphs/graphdata_custom.cpp b/Graphs/graphdata_custom.cpp
index d17626b5..a930b8c8 100644
--- a/Graphs/graphdata_custom.cpp
+++ b/Graphs/graphdata_custom.cpp
@@ -4,7 +4,8 @@
  License: GPL
 *********************************************************************/
 
-#include <math.h>
+#include <cmath>
+#include <QDebug>
 #include "graphdata_custom.h"
 
 
@@ -50,7 +51,11 @@ void WaveData::Reload(Day *day)
                 QPointD r(st,(*w)[i]);
                 st+=rate;
                 (point[vc][t++])=r;
-                assert(t<max_points);
+                if (t>=max_points) {
+                    qWarning()<< "WaveData max_points exceeded";
+                    break;
+                }
+                //assert(t<max_points);
                 if (first) {
                     max_y=min_y=r.y();
                     first=false;
@@ -117,8 +122,8 @@ void EventData::Reload(Day *day)
     min_x=day->first()/86400000.0;
     max_x=day->last()/86400000.0;
     if (min_x>max_x) {
-        //int a=5;
-        assert(min_x<max_x);
+        qWarning() << "EventData min_x > max_x";
+        return;
     }
     min_y=max_y=0;
     int tt=0;
@@ -137,7 +142,10 @@ void EventData::Reload(Day *day)
             if (((p!=0) && skipzero) || !skipzero) {
                 QPointD r((*ev)->time()/86400000.0,p);
                 point[vc][t++]=r;
-                assert(t<max_points);
+                if (t>=max_points) {
+                    qWarning() << "EventData max_points exceeded";
+                    break;
+                }
                 if (first) {
                     max_y=min_y=r.y();
                     //lastp=p;
@@ -225,8 +233,10 @@ void TAPData::Reload(Day *day)
                 first=false; // only bother setting lastval (below) this time.
             } else {
                 double d=(ev.time()-last)/1000.0;
-
-                assert(lastval<max_slots);
+                if (lastval>=max_slots) {
+                    qWarning() << "TapData: lastval<max_slots";
+                    break;
+                }
                 pTime[lastval]+=d;
             }
             cnt++;
@@ -304,6 +314,7 @@ void FlagData::Reload(Day *day)
     min_x=day->first()/86400000.0;
     max_x=day->last()/86400000.0;
 
+    bool done=false;
     for (vector<Session *>::iterator s=day->begin();s!=day->end();s++) {
         if ((*s)->events.find(code)==(*s)->events.end()) continue;
         //first=true;
@@ -318,7 +329,11 @@ void FlagData::Reload(Day *day)
             v2=point[vc][c].y();
             //point[vc][c].z=value;
             c++;
-            assert(c<max_points);
+            if (c>=max_points) {
+                qWarning() << "FlagData: max_points exceeded";
+                done=true;
+                break;
+            }
             /*if (first) {
                 min_y=v1;
                 first=false;
@@ -328,6 +343,7 @@ void FlagData::Reload(Day *day)
             }
             if (v2>max_x) max_x=v2; */
         }
+        if (done) break;
     }
     min_y=-value;
     max_y=value;
diff --git a/Graphs/graphwindow.cpp b/Graphs/graphwindow.cpp
index e964e272..3649085e 100644
--- a/Graphs/graphwindow.cpp
+++ b/Graphs/graphwindow.cpp
@@ -262,7 +262,7 @@ void gGraphWindow::updateSelectionTime()
     seconds=int(f*24*3600.0) % 60;
     QString s;
     if (f>1) {
-        s.sprintf("%.1f days",f);
+        s.sprintf("%.0f days",f);
     } else if (f>(1.0/(24.0*12.0))) {
         s.sprintf("%02i:%02i:%02i",hours,minutes,seconds);
     } else {
@@ -355,7 +355,10 @@ void gGraphWindow::mouseMoveEvent(QMouseEvent * event)
         SetXBounds(qx,ex);
         if (pref["LinkGraphMovement"].toBool()) {
             for (list<gGraphWindow *>::iterator g=link_zoom.begin();g!=link_zoom.end();g++) {
-                assert((*g)!=this);
+                if (*g==this) {
+                    qWarning() << "mouseMoveEvent *g should not equal this";
+                    continue;
+                }
                 (*g)->SetXBounds(qx,ex);
             }
         }
@@ -397,7 +400,7 @@ void gGraphWindow::mouseMoveEvent(QMouseEvent * event)
         seconds=int(f*3600.0) % 60;
         QString s;
         if (z>1) {
-            s.sprintf("%.1f days",q*z);
+            s.sprintf("%.0f days",q*z);
         } else if (z>(1.0/(24.0*12.0))) {
             s.sprintf("%02i:%02i:%02i",hours,minutes,seconds);
         } else {
@@ -670,11 +673,6 @@ void gGraphWindow::OnMouseLeftDown(QMouseEvent * event)
         LastGraphLDown=this;
     }
 }
-void gGraphWindow::dropEvent ( QDropEvent * event )
-{
-    assert(splitter!=NULL);
-    //m_dragGraph=false;
-}
 
 void gGraphWindow::OnMouseLeftRelease(QMouseEvent * event)
 {
diff --git a/Graphs/graphwindow.h b/Graphs/graphwindow.h
index efd1c94c..2f951040 100644
--- a/Graphs/graphwindow.h
+++ b/Graphs/graphwindow.h
@@ -32,7 +32,6 @@ public:
 
 signals:
 public slots:
-    void dropEvent(QDropEvent * event);
 public:
     QBitmap * RenderBitmap(int width,int height);
 
diff --git a/SleepLib/day.cpp b/SleepLib/day.cpp
index e9e0a38c..ccb087e5 100644
--- a/SleepLib/day.cpp
+++ b/SleepLib/day.cpp
@@ -285,7 +285,11 @@ qint64 Day::last(MachineCode code)
         Session & sess=*(*s);
         if (sess.events.find(code)!=sess.events.end()) {
             vector<Event *>::reverse_iterator i=sess.events[code].rbegin();
-            assert(i!=sess.events[code].rend());
+            if (i==sess.events[code].rend()) {
+                qWarning() << "Day::last() i==sess.events[code].rend()";
+                continue;
+            }
+            //assert(i!=sess.events[code].rend());
             tmp=(*i)->time();
             if (!date) {
                 date=tmp;
diff --git a/SleepLib/loader_plugins/prs1_loader.cpp b/SleepLib/loader_plugins/prs1_loader.cpp
index 06e529ec..22b084ad 100644
--- a/SleepLib/loader_plugins/prs1_loader.cpp
+++ b/SleepLib/loader_plugins/prs1_loader.cpp
@@ -963,7 +963,10 @@ bool PRS1Loader::OpenWaveforms(Session *session,QString filename)
         unsigned char sum=0,hchk;
         for (int i=0; i<hl; i++) sum+=header[i];
 
-        assert(numsignals<max_signals);
+        if (numsignals>=max_signals) {
+            qWarning() << "PRS1Loader::OpenWaveforms() numsignals >= max_signals";
+            return false;
+        }
         char buf[3];
         for (int i=0;i<numsignals;i++) {
             f.read(buf,3);
diff --git a/SleepLib/preferences.cpp b/SleepLib/preferences.cpp
index 66e0b588..fbb9b46d 100644
--- a/SleepLib/preferences.cpp
+++ b/SleepLib/preferences.cpp
@@ -185,7 +185,10 @@ bool Preferences::Open(QString filename)
     for( ; pElem; pElem=pElem->NextSiblingElement()) {
 
         TiXmlAttribute *attr=pElem->FirstAttribute();
-        assert(attr!=NULL);
+        if (!attr) {
+            qWarning() << "Preferences::Open() attr==NULL!";
+            return false;
+        }
         QString type=attr->Value();
         type=type.toLower();
         QString pKey=pElem->Value();
diff --git a/SleepLib/profiles.cpp b/SleepLib/profiles.cpp
index a93d4ce2..a8ba6d14 100644
--- a/SleepLib/profiles.cpp
+++ b/SleepLib/profiles.cpp
@@ -99,8 +99,10 @@ void Profile::ExtraLoad(TiXmlHandle *root)
     }
     for(; elem; elem=elem->NextSiblingElement()) {
         QString pKey=elem->Value();
-        assert(pKey=="Machine");
-
+        if (pKey!="Machine") {
+            qWarning() << "Profile::ExtraLoad() pKey!=\"Machine\"";
+            continue;
+        }
         int m_id;
         elem->QueryIntAttribute("id",&m_id);
         int mt;
@@ -235,7 +237,10 @@ vector<Machine *> Profile::GetMachines(MachineType t)
     map<MachineID,Machine *>::iterator i;
 
     for (i=machlist.begin(); i!=machlist.end(); i++) {
-        assert(i->second!=NULL);
+        if (!i->second) {
+            qWarning() << "Profile::GetMachines() i->second == NULL";
+            continue;
+        }
         if (i->second->GetType()==t) {
             vec.push_back(i->second);
         }
diff --git a/SleepLib/session.h b/SleepLib/session.h
index c418af92..b59f9e46 100644
--- a/SleepLib/session.h
+++ b/SleepLib/session.h
@@ -8,6 +8,7 @@
 #ifndef SESSION_H
 #define SESSION_H
 
+#include <QDebug>
 #include "SleepLib/machine.h"
 
 class Machine;
@@ -51,7 +52,10 @@ public:
         else if (d<s_first) s_first=d;
     };
     void set_last(qint64 d) {
-        assert(d>s_first);
+        if (d<=s_first) {
+            qWarning() << "Session::set_last() d<=s_first";
+            return;
+        }
         if (!s_last) s_last=d;
         else if (s_last<d) s_last=d;
     };
diff --git a/daily.cpp b/daily.cpp
index e772664b..02043695 100644
--- a/daily.cpp
+++ b/daily.cpp
@@ -150,7 +150,7 @@ Daily::Daily(QWidget *parent,QGLContext *context) :
     FRW->AddLayer(new gLineOverlayBar(flags[2],QColor("#40c0ff"),"OA"));
     FRW->AddLayer(new gLineOverlayBar(flags[1],QColor("purple"),"CA"));
 
-    FRW->setMinimumHeight(190);
+    FRW->setMinimumHeight(150);
 
     AddCPAPData(snore=new EventData(CPAP_Snore,0));
     SNORE=new gGraphWindow(gSplitter,tr("Snore"),SF);
diff --git a/overview.cpp b/overview.cpp
index 450ab2e6..4f15276b 100644
--- a/overview.cpp
+++ b/overview.cpp
@@ -49,7 +49,7 @@ Overview::Overview(QWidget *parent,QGLContext *context) :
     AddGraph(AHI=new gGraphWindow(ui->SummaryGraphWindow,tr("AHI"),(QGLWidget *)NULL));
     AHI->SetTopMargin(10);
     AHI->SetBottomMargin(AHI->GetBottomMargin()+gXAxis::Margin+25);
-    AHI->AddLayer(new gFooBar(7));
+    //AHI->AddLayer(new gFooBar(7));
     AHI->AddLayer(new gYAxis());
     AHI->AddLayer(new gBarChart(ahidata,QColor("red")));
     AHI->setMinimumHeight(170);
@@ -58,7 +58,7 @@ Overview::Overview(QWidget *parent,QGLContext *context) :
     //PRESSURE->SetMargins(10,15,65,80);
     PRESSURE->AddLayer(new gYAxis());
     PRESSURE->AddLayer(new gXAxis());
-    PRESSURE->AddLayer(new gFooBar(7));
+    //PRESSURE->AddLayer(new gFooBar(7));
     PRESSURE->AddLayer(prmax=new gLineChart(pressure_max,QColor("blue"),6192,false,true,true));
     PRESSURE->AddLayer(prmin=new gLineChart(pressure_min,QColor("red"),6192,false,true,true));
     PRESSURE->AddLayer(eap=new gLineChart(pressure_eap,QColor("blue"),6192,false,true,true));
@@ -70,13 +70,13 @@ Overview::Overview(QWidget *parent,QGLContext *context) :
     AddGraph(LEAK=new gGraphWindow(ui->SummaryGraphWindow,tr("Leak"),AHI));
     LEAK->AddLayer(new gXAxis());
     LEAK->AddLayer(new gYAxis());
-    LEAK->AddLayer(new gFooBar(7));
+    //LEAK->AddLayer(new gFooBar(7));
     LEAK->AddLayer(new gLineChart(leak,QColor("purple"),6192,false,false,true));
     LEAK->SetBottomMargin(LEAK->GetBottomMargin()+25);
     LEAK->setMinimumHeight(170);
 
     AddGraph(USAGE=new gGraphWindow(ui->SummaryGraphWindow,tr("Usage (Hours)"),AHI));
-    USAGE->AddLayer(new gFooBar(7));
+    //USAGE->AddLayer(new gFooBar(7));
     USAGE->AddLayer(new gYAxis());
     USAGE->AddLayer(new gBarChart(usage,QColor("green")));
     USAGE->SetBottomMargin(USAGE->GetBottomMargin()+gXAxis::Margin+25);
@@ -86,7 +86,7 @@ Overview::Overview(QWidget *parent,QGLContext *context) :
 
     AddGraph(SESSTIMES=new gGraphWindow(ui->SummaryGraphWindow,tr("Session Times"),AHI));
     //SESSTIMES->SetMargins(10,15,65,80);
-    SESSTIMES->AddLayer(new gFooBar(7));
+    //SESSTIMES->AddLayer(new gFooBar(7));
     SESSTIMES->AddLayer(new gTimeYAxis());
     SESSTIMES->AddLayer(new gSessionTime(session_times,QColor("green")));
     SESSTIMES->SetBottomMargin(SESSTIMES->GetBottomMargin()+gXAxis::Margin+25);
@@ -106,6 +106,7 @@ Overview::Overview(QWidget *parent,QGLContext *context) :
 
     for (int i=0;i<ss;i++) {
         AddGraph(graphs[i]);
+        graphs[i]->AddLayer(new gFooBar(7));
         for (int j=0;j<ss;j++) {
             if (graphs[i]!=graphs[j])
                 graphs[i]->LinkZoom(graphs[j]);