diff --git a/SleepLib/profiles.cpp b/SleepLib/profiles.cpp
index 786f7962..0b67506c 100644
--- a/SleepLib/profiles.cpp
+++ b/SleepLib/profiles.cpp
@@ -47,51 +47,54 @@ Profile::Profile(QString path)
     machlist.clear();
     //m_first=m_last=NULL;
 }
+bool Profile::Save(QString filename)
+{
+    if (p_profile==this) {
+        QString cachefile=Get("{DataFolder}")+QDir::separator()+"cache.day";
+        QFile f(cachefile);
+        if (ExistsAndTrue("TrashDayCache"))  {
+            if (f.exists()) {
+                f.remove();
+            }
+        } else {
+            QMap<QDate,QList<Day *> >::iterator di;
+            QHash<MachineID,QMap<QDate,QHash<ChannelID, EventDataType> > > cache;
+
+            QHash<MachineID,QMap<QDate,QHash<ChannelID, EventDataType> > >::iterator ci;
+            for (di=daylist.begin();di!=daylist.end();di++) {
+                QDate date=di.key();
+                for (QList<Day *>::iterator d=di.value().begin();d!=di.value().end();d++) {
+                    Day *day=*d;
+                    MachineID mach=day->machine->id();
+                    QHash<ChannelID, EventDataType>::iterator i;
+
+                    for (i=day->m_p90.begin();i!=day->m_p90.end();i++) {
+                        cache[mach][date][i.key()]=day->m_p90[i.key()];
+                    }
+                }
+            }
+            if (f.open(QFile::WriteOnly)) {
+                QDataStream out(&f);
+                out.setVersion(QDataStream::Qt_4_6);
+                out.setByteOrder(QDataStream::LittleEndian);
+                quint16 size=cache.size();
+                out << size;
+                for (ci=cache.begin();ci!=cache.end();ci++) {
+                    quint32 mid=ci.key();
+                    out << mid;
+                    out << ci.value();
+                }
+                f.close();
+            }
+        }
+        (*this)["TrashDayCache"]=false;
+    }
+    return Preferences::Save(filename);
+}
+
 
 Profile::~Profile()
 {
-    QMap<QDate,QList<Day *> >::iterator di;
-    QHash<MachineID,QMap<QDate,QHash<ChannelID, EventDataType> > > cache;
-
-    QHash<MachineID,QMap<QDate,QHash<ChannelID, EventDataType> > >::iterator ci;
-    for (di=daylist.begin();di!=daylist.end();di++) {
-        QDate date=di.key();
-        for (QList<Day *>::iterator d=di.value().begin();d!=di.value().end();d++) {
-            Day *day=*d;
-            MachineID mach=day->machine->id();
-            QHash<ChannelID, EventDataType>::iterator i;
-
-            for (i=day->m_p90.begin();i!=day->m_p90.end();i++) {
-                cache[mach][date][i.key()]=day->m_p90[i.key()];
-            }
-        }
-    }
-    QString filename=Get("{DataFolder}")+QDir::separator()+"cache.day";
-    QFile f(filename);
-    if (f.open(QFile::WriteOnly)) {
-        QDataStream out(&f);
-        out.setVersion(QDataStream::Qt_4_6);
-        out.setByteOrder(QDataStream::LittleEndian);
-        quint16 size=cache.size();
-        out << size;
-        for (ci=cache.begin();ci!=cache.end();ci++) {
-            quint32 mid=ci.key();
-            out << mid;
-            out << ci.value();
-        }
-        /*quint16 size=cache.size();
-        out << size;
-        QMap<QDate,QHash<ChannelID, EventDataType> >::iterator i;
-        for (i=cache.begin();i!=cache.end();i++) {
-            QDate a=i.key();
-            out << a;
-        }
-        for (i=cache.begin();i!=cache.end();i++) {
-            out << cache[i.key()];
-        }*/
-        f.close();
-    }
-
     for (QHash<MachineID,Machine *>::iterator i=machlist.begin(); i!=machlist.end(); i++) {
         delete i.value();
     }
diff --git a/SleepLib/profiles.h b/SleepLib/profiles.h
index aa412410..3f428507 100644
--- a/SleepLib/profiles.h
+++ b/SleepLib/profiles.h
@@ -30,6 +30,8 @@ public:
     Profile();
     virtual ~Profile();
 
+    virtual bool Save(QString filename="");
+
     bool is_first_day;
     QHash<MachineID,Machine *> machlist;
     void AddMachine(Machine *m);
diff --git a/main.cpp b/main.cpp
index 220ae558..6f7b1366 100644
--- a/main.cpp
+++ b/main.cpp
@@ -89,6 +89,9 @@ int main(int argc, char *argv[])
 
     for (int i=1;i<args.size();i++) {
         if (args[i]=="-l") force_login_screen=true;
+        if (args[i]=="-p") {
+            sleep(1);
+        }
     }
 
     a.setApplicationName("SleepyHead");
diff --git a/preferencesdialog.cpp b/preferencesdialog.cpp
index 8308e6da..29e0dfaf 100644
--- a/preferencesdialog.cpp
+++ b/preferencesdialog.cpp
@@ -319,14 +319,15 @@ void PreferencesDialog::Save()
     (*profile)["MaskStartDate"]=ui->startedUsingMask->date();
     (*profile)["GraphHeight"]=ui->graphHeight->value();
 
-    if ((*profile)["CombineCloserSessions"].toInt()!=ui->combineSlider->value()) needs_restart=true;
-    if ((*profile)["IgnoreShorterSessions"].toInt()!=ui->IgnoreSlider->value()) needs_restart=true;
+    if (((*profile)["DaySplitTime"].toTime()!=ui->timeEdit->time()) ||
+    ((*profile)["CombineCloserSessions"].toInt()!=ui->combineSlider->value()) ||
+    ((*profile)["IgnoreShorterSessions"].toInt()!=ui->IgnoreSlider->value())) {
+        PROFILE["TrashDayCache"]=true;
+        needs_restart=true;
+    } else PROFILE["TrashDayCache"]=false;
 
     (*profile)["CombineCloserSessions"]=ui->combineSlider->value();
     (*profile)["IgnoreShorterSessions"]=ui->IgnoreSlider->value();
-
-    if ((*profile)["DaySplitTime"].toTime()!=ui->timeEdit->time()) needs_restart=true;
-
     (*profile)["DaySplitTime"]=ui->timeEdit->time();
 
     (*profile)["AlwaysShowOverlayBars"]=ui->overlayFlagsCombo->currentIndex();
@@ -440,8 +441,8 @@ void PreferencesDialog::Save()
         file.close();
     }
 
-    PROFILE.Save();
-    PREF.Save();
+    //PROFILE.Save();
+    //PREF.Save();
 
     if (needs_restart) {
         if (QMessageBox::question(this,"Restart Required","One or more of the changes you have made will require this application to be restarted, in order for these changes to come into effect.\nWould you like do this now?",QMessageBox::Yes,QMessageBox::No)==QMessageBox::Yes) {
@@ -455,6 +456,7 @@ void PreferencesDialog::Save()
 
             QStringList args;
             args << "-n" << apppath; // -n option is important, as it opens a new process
+            args << "-p";
 
             if (QProcess::startDetached("/usr/bin/open",args)) {
                 QApplication::instance()->exit();
@@ -469,7 +471,9 @@ void PreferencesDialog::Save()
             //if (QDesktopServices::openUrl(apppath)) {
             //    QApplication::instance()->exit();
             //} else
-            if (QProcess::startDetached(apppath)) {
+            QStringList args;
+            args << "-p";
+            if (QProcess::startDetached(apppath,args)) {
                 QApplication::instance()->exit();
             } else QMessageBox::warning(this,"Gah!","If you can read this, the restart command didn't work. Your going to have to do it yourself manually.",QMessageBox::Ok);
     #endif