diff --git a/sleepyhead/Graphs/gGraphView.cpp b/sleepyhead/Graphs/gGraphView.cpp
index d6c63699..97dd1566 100644
--- a/sleepyhead/Graphs/gGraphView.cpp
+++ b/sleepyhead/Graphs/gGraphView.cpp
@@ -1,4 +1,4 @@
-/* gGraphView Implementation
+/* gGraphView Implementation
  *
  * Copyright (c) 2011-2018 Mark Watkins <mark@jedimark.net>
  *
@@ -1434,7 +1434,7 @@ void gGraphView::paintGL()
     m_tooltip->paint(painter);
 
 #ifdef DEBUG_EFFICIENCY
-    const int rs = 10;
+    const int rs = 20;
     static double ring[rs] = {0};
     static int rp = 0;
 
diff --git a/sleepyhead/SleepLib/day.cpp b/sleepyhead/SleepLib/day.cpp
index 8480ae61..a7f7364c 100644
--- a/sleepyhead/SleepLib/day.cpp
+++ b/sleepyhead/SleepLib/day.cpp
@@ -1,4 +1,4 @@
-/* SleepLib Day Class Implementation
+/* SleepLib Day Class Implementation
  *
  * Copyright (c) 2011-2018 Mark Watkins <mark@jedimark.net>
  *
@@ -379,7 +379,8 @@ EventDataType Day::percentile(ChannelID code, EventDataType percentile)
     }
 
     // sort by weight, then value
-    qSort(valcnt); //std::sort(valcnt.begin(), valcnt.end());
+    //qSort(valcnt);
+    std::sort(valcnt.begin(), valcnt.end());
 
     //double SN=100.0/double(N); // 100% / overall sum
     double p = 100.0 * percentile;
@@ -550,7 +551,8 @@ EventDataType Day::rangePercentile(ChannelID code, float p, qint64 st, qint64 et
     }
 
     // TODO: use nth_element instead..
-    qSort(list); //std::sort(list.begin(), list.end());
+    //qSort(list);
+    std::sort(list.begin(), list.end());
 
     float b = float(idx) * p;
     int a = floor(b);
diff --git a/sleepyhead/SleepLib/loader_plugins/mseries_loader.cpp b/sleepyhead/SleepLib/loader_plugins/mseries_loader.cpp
index 4f62f814..ef6f16e7 100644
--- a/sleepyhead/SleepLib/loader_plugins/mseries_loader.cpp
+++ b/sleepyhead/SleepLib/loader_plugins/mseries_loader.cpp
@@ -1,4 +1,4 @@
-/* SleepLib RemStar M-Series Loader Implementation
+/* SleepLib RemStar M-Series Loader Implementation
  *
  * Copyright (c) 2011-2018 Mark Watkins <mark@jedimark.net>
  *
@@ -175,7 +175,7 @@ int MSeriesLoader::Open(const QString & path)
 
     QList<quint16> head, tail;
     controlblock += 3;
-    quint16 datastarts, dataends, h16, t16;//, tmp16,
+    quint16 datastarts=0, dataends=0, h16, t16;//, tmp16,
 
     if (controlblock[0]) {
         datastarts = controlblock[1] | (controlblock[2] << 8);