diff --git a/Engine/API/Abstract/abstractrhxcontroller.cpp b/Engine/API/Abstract/abstractrhxcontroller.cpp
index 26611ff..09a991a 100644
--- a/Engine/API/Abstract/abstractrhxcontroller.cpp
+++ b/Engine/API/Abstract/abstractrhxcontroller.cpp
@@ -665,14 +665,13 @@ unsigned int AbstractRHXController::fifoCapacityInWords()
 // Print a command list to the console in readable form.
 void AbstractRHXController::printCommandList(const vector<unsigned int> &commandList) const
 {
-    unsigned int i, cmd;
     int channel, reg, data, uFlag, mFlag, dFlag, hFlag;
 
     cout << '\n';
-    for (i = 0; i < commandList.size(); ++i) {
-        cmd = commandList[i];
+    for (uint i = 0; i < commandList.size(); ++i) {
+        auto cmd = commandList[i];
         if (type != ControllerStimRecord) {
-            if (cmd < 0 || cmd > 0xffff) {
+            if ((int)cmd < 0 || cmd > 0xffff) {
                 cout << "  command[" << i << "] = INVALID COMMAND: " << cmd << '\n';
             } else if ((cmd & 0xc000) == 0x0000) {
                 channel = (cmd & 0x3f00) >> 8;
diff --git a/Engine/API/Hardware/rhxregisters.cpp b/Engine/API/Hardware/rhxregisters.cpp
index 2d4b882..6a9a26e 100644
--- a/Engine/API/Hardware/rhxregisters.cpp
+++ b/Engine/API/Hardware/rhxregisters.cpp
@@ -1122,7 +1122,7 @@ unsigned int RHXRegisters::createRHXCommand(RHXCommandType commandType, unsigned
     } else {
         switch (commandType) {
         case RHXCommandConvert:
-            if ((arg1 < 0) || (arg1 > 63)) {
+            if (((int)arg1 < 0) || (arg1 > 63)) {
                 cerr << "Error in RHXRegisters::createRHXCommand: " <<
                         "Channel number out of range.\n";
                 return -1;
@@ -1130,7 +1130,7 @@ unsigned int RHXRegisters::createRHXCommand(RHXCommandType commandType, unsigned
             return 0x0000 + (arg1 << 8);  // 00cccccc0000000h; if the command is 'Convert',
                                           // arg1 is the channel number.
         case RHXCommandRegRead:
-            if ((arg1 < 0) || (arg1 > 63)) {
+            if (((int)arg1 < 0) || (arg1 > 63)) {
                 cerr << "Error in RHXRegisters::createRHXCommand: " <<
                         "Register address out of range.\n";
                 return -1;
@@ -1182,12 +1182,12 @@ unsigned int RHXRegisters::createRHXCommand(RHXCommandType commandType, unsigned
     } else {
         switch (commandType) {
         case RHXCommandRegWrite:
-            if ((arg1 < 0) || (arg1 > 63)) {
+            if (((int)arg1 < 0) || (arg1 > 63)) {
                 cerr << "Error in RHXRegisters::createRHXCommand: " <<
                         "Register address out of range.\n";
                 return -1;
             }
-            if ((arg2 < 0) || (arg2 > 255)) {
+            if (((int)arg2 < 0) || (arg2 > 255)) {
                 cerr << "Error in RHXRegisters::createRHXCommand: " <<
                         "Register data out of range.\n";
                 return -1;
diff --git a/Engine/Processing/xmlinterface.cpp b/Engine/Processing/xmlinterface.cpp
index 2fff4b3..cb10990 100644
--- a/Engine/Processing/xmlinterface.cpp
+++ b/Engine/Processing/xmlinterface.cpp
@@ -884,7 +884,7 @@ void XMLInterface::parseSignalGroupsAttributes(const QByteArray &byteArray, QStr
 {
     QXmlStreamReader stream(byteArray);
     while (!stream.atEnd()) {
-        while (stream.name() != "SignalGroup") {
+        while (stream.name() != QStringLiteral("SignalGroup")) {
             QXmlStreamReader::TokenType token = stream.readNext();
             if (token == QXmlStreamReader::EndDocument) {
                 return;
@@ -894,7 +894,7 @@ void XMLInterface::parseSignalGroupsAttributes(const QByteArray &byteArray, QStr
         QXmlStreamAttributes attributes = stream.attributes();
         QString portName("");
         for (auto attribute : attributes) {
-            if (attribute.name().toString().toLower() == "prefix") {
+            if (attribute.name().toString().toLower() == QStringLiteral("prefix")) {
                 portName = "Port " + attribute.value().toString();
                 break;
             }
@@ -910,7 +910,7 @@ void XMLInterface::parseSignalGroupsAttributes(const QByteArray &byteArray, QStr
             QString attributeName = attribute.name().toString();
             QString attributeValue = attribute.value().toString();
 
-            if (attributeValue != "N/A") {
+            if (attributeValue != QStringLiteral("N/A")) {
                 StateSingleItem *singleItem = state->locateStateSingleItem(thisSignalGroup->portItems, attributeName);
 
                 // If the attribute is a StateSingleItem, set it according to XMLIncludeParameters.
diff --git a/GUI/Widgets/pageview.cpp b/GUI/Widgets/pageview.cpp
index 66cd247..c797995 100644
--- a/GUI/Widgets/pageview.cpp
+++ b/GUI/Widgets/pageview.cpp
@@ -1266,8 +1266,8 @@ QString PageView::getSiteShape(int port, int site)
 
 void PageView::overwriteColor(QColor &color, const QString& colorName)
 {
-    if (color.isValidColor(colorName))
-        color.setNamedColor(colorName);
+    if (color.isValidColorName(colorName))
+        color = QColor::fromString(colorName);
 }
 
 void PageView::overwriteFloat(float &original, float newValue) {
diff --git a/GUI/Widgets/testcontrolpanel.cpp b/GUI/Widgets/testcontrolpanel.cpp
index 9e3bdca..9628766 100644
--- a/GUI/Widgets/testcontrolpanel.cpp
+++ b/GUI/Widgets/testcontrolpanel.cpp
@@ -94,8 +94,8 @@ TestControlPanel::TestControlPanel(ControllerInterface *controllerInterface_, Ab
     helpDialogCheckInputWave(nullptr),
     helpDialogTestChip(nullptr),
     helpDialogUploadTestStimParameters(nullptr),
-    previousDelay(-1),
     portComboBox(nullptr),
+    previousDelay(-1),
     auxIn1Min(3.3),
     auxIn1Max(0),
     auxIn1Median(0),
@@ -830,13 +830,11 @@ void TestControlPanel::recordDummySegment(double duration, int portIndex)
 void TestControlPanel::allocateDoubleArray3D(QVector<QVector<QVector<double> > > &array3D,
                                             int xSize, int ySize, int zSize)
 {
-    int i, j;
-
     if (xSize == 0) return;
     array3D.resize(xSize);
-    for (i = 0; i < xSize; ++i) {
+    for (int i = 0; i < xSize; ++i) {
         array3D[i].resize(ySize);
-        for (j = 0; j < ySize; ++j) {
+        for (int j = 0; j < ySize; ++j) {
             array3D[i][j].resize(zSize);
         }
     }
@@ -846,11 +844,9 @@ void TestControlPanel::allocateDoubleArray3D(QVector<QVector<QVector<double> > >
 void TestControlPanel::allocateDoubleArray2D(QVector<QVector<double> > &array2D,
                                             int xSize, int ySize)
 {
-    int i, j;
-
     if (xSize == 0) return;
     array2D.resize(xSize);
-    for (i = 0; i < xSize; ++i) {
+    for (int i = 0; i < xSize; ++i) {
         array2D[i].resize(ySize);
     }
 }