diff --git a/src/apps/cortex/DormantNodeView/DormantNodeListItem.cpp b/src/apps/cortex/DormantNodeView/DormantNodeListItem.cpp
index dd35f1cb65..7f9093beb4 100644
--- a/src/apps/cortex/DormantNodeView/DormantNodeListItem.cpp
+++ b/src/apps/cortex/DormantNodeView/DormantNodeListItem.cpp
@@ -69,12 +69,12 @@ void DormantNodeListItem::DrawItem(
 		r.right = r.left + B_MINI_ICON - 1.0;
 		r.bottom = r.top + B_MINI_ICON - 1.0;
 		if (IsSelected()) {
-			owner->SetHighColor(255.0, 255.0, 255.0, 255.0);
+			owner->SetHighColor(255, 255, 255, 255);
 			owner->FillRect(r);
 			owner->SetDrawingMode(B_OP_INVERT);
 			owner->DrawBitmap(m_icon, r.LeftTop());
 			owner->SetDrawingMode(B_OP_ALPHA);
-			owner->SetHighColor(0.0, 0.0, 0.0, 180.0);
+			owner->SetHighColor(0, 0, 0, 180);
 			owner->SetBlendingMode(B_CONSTANT_ALPHA, B_ALPHA_COMPOSITE);
 			owner->DrawBitmap(m_icon, r.LeftTop());
 			owner->SetDrawingMode(B_OP_OVER);
@@ -93,7 +93,7 @@ void DormantNodeListItem::DrawItem(
 	r.bottom = r.top + m_fontHeight.ascent + m_fontHeight.descent;		
 	if (IsSelected() || drawEverything) {
 		if (IsSelected()) {
-			owner->SetHighColor(16.0, 64.0, 96.0, 255.0);
+			owner->SetHighColor(16, 64, 96, 255);
 		}
 		else {
 			owner->SetHighColor(owner->ViewColor());
@@ -101,10 +101,10 @@ void DormantNodeListItem::DrawItem(
 		owner->FillRect(r);
 	}
 	if (IsSelected()) {
-		owner->SetHighColor(255.0, 255.0, 255.0, 255.0);
+		owner->SetHighColor(255, 255, 255, 255);
 	}
 	else {
-		owner->SetHighColor(0.0, 0.0, 0.0, 0.0);
+		owner->SetHighColor(0, 0, 0, 0);
 	}
 	BPoint labelOffset(r.left + 1.0, r.bottom - m_fontHeight.descent);
 	owner->DrawString(m_info.name, labelOffset);
@@ -199,10 +199,10 @@ BBitmap *DormantNodeListItem::getDragBitmap() {
 		BView *dragView = new BView(dragBitmap->Bounds(), "", B_FOLLOW_NONE, 0); 
 		dragBitmap->AddChild(dragView); 
 		dragView->SetOrigin(0.0, 0.0);
-		dragView->SetHighColor(0.0, 0.0, 0.0, 0.0);
+		dragView->SetHighColor(0, 0, 0, 0);
 		dragView->FillRect(dragView->Bounds()); 
 		dragView->SetDrawingMode(B_OP_ALPHA); 
-		dragView->SetHighColor(0.0, 0.0, 0.0, 128.0);       
+		dragView->SetHighColor(0, 0, 0, 128);       
 	    dragView->SetBlendingMode(B_CONSTANT_ALPHA, B_ALPHA_COMPOSITE); 
 		// Drawing code back again
 		if (m_icon) {
diff --git a/src/apps/cortex/RouteApp/StatusView.cpp b/src/apps/cortex/RouteApp/StatusView.cpp
index 7a32945262..2990064c04 100644
--- a/src/apps/cortex/RouteApp/StatusView.cpp
+++ b/src/apps/cortex/RouteApp/StatusView.cpp
@@ -288,7 +288,7 @@ StatusView::drawInto(BView *v, BRect updateRect)
 
 	r.InsetBy(2.0, 0.0);
 	v->SetDrawingMode(B_OP_ALPHA);
-	v->SetHighColor(0, 0, 0, 255 * m_opacity);
+	v->SetHighColor(0, 0, 0, uchar(255 * m_opacity));
 
 	// draw icon
 	if (m_icon) {
diff --git a/src/apps/cortex/ValControl/ValControlDigitSegment.cpp b/src/apps/cortex/ValControl/ValControlDigitSegment.cpp
index 38243b94fe..8373f8f20d 100644
--- a/src/apps/cortex/ValControl/ValControlDigitSegment.cpp
+++ b/src/apps/cortex/ValControl/ValControlDigitSegment.cpp
@@ -316,7 +316,7 @@ void ValControlDigitSegment::MessageReceived(BMessage* pMsg) {
 		case ValControl::M_SET_VALUE:
 			err = pMsg->FindDouble("value", &fVal);
 			ASSERT(err == B_OK);
-			setValue(fVal, fVal < 0);
+			setValue((int64)fVal, fVal < 0);
 			break;
 			
 		case ValControl::M_GET_VALUE: {
diff --git a/src/apps/cortex/support/ILockable.h b/src/apps/cortex/support/ILockable.h
index 48845a8adb..4a91c7a312 100644
--- a/src/apps/cortex/support/ILockable.h
+++ b/src/apps/cortex/support/ILockable.h
@@ -32,6 +32,9 @@ __BEGIN_CORTEX_NAMESPACE
 // the locking interface
 
 class ILockable {
+public:
+	ILockable() { }
+	virtual ~ILockable() { }
 public:						// constants
 	enum lock_t {
 		WRITE,
diff --git a/src/apps/cortex/support/IObservable.h b/src/apps/cortex/support/IObservable.h
index d48920e6c3..f8e858baf5 100644
--- a/src/apps/cortex/support/IObservable.h
+++ b/src/apps/cortex/support/IObservable.h
@@ -14,6 +14,9 @@ __BEGIN_CORTEX_NAMESPACE
 
 class IObservable {
 
+public:
+	IObservable() { }
+	virtual ~IObservable() { }
 public:											// *** deletion
 	// clients must call release() rather than deleting,
 	// to ensure that all observers are notified of the
diff --git a/src/apps/cortex/support/MouseTrackingHelpers.h b/src/apps/cortex/support/MouseTrackingHelpers.h
index 70fe9a9c0a..423d9826be 100644
--- a/src/apps/cortex/support/MouseTrackingHelpers.h
+++ b/src/apps/cortex/support/MouseTrackingHelpers.h
@@ -25,6 +25,8 @@ class MouseTrackingSourceView;
 // interface for a mouse-tracking destination
 class IMouseTrackingDestination {
 public:							// operations
+	IMouseTrackingDestination() { }
+	virtual ~IMouseTrackingDestination() { }
 	// a MouseTrackingSourceView has started tracking the mouse
 	// (point is in pSource view coordinates)
 	virtual void mouseTrackingBegin(
diff --git a/src/apps/cortex/support/ObservableHandler.cpp b/src/apps/cortex/support/ObservableHandler.cpp
index a10ee01ac9..507664eb23 100644
--- a/src/apps/cortex/support/ObservableHandler.cpp
+++ b/src/apps/cortex/support/ObservableHandler.cpp
@@ -267,4 +267,4 @@ void ObservableHandler::_handleRemoveObserver(
 }
 
 
-// END -- ObservableHandler.cpp --
\ No newline at end of file
+// END -- ObservableHandler.cpp --
diff --git a/src/apps/cortex/support/TextControlFloater.cpp b/src/apps/cortex/support/TextControlFloater.cpp
index 1778e35418..7b62cb049c 100644
--- a/src/apps/cortex/support/TextControlFloater.cpp
+++ b/src/apps/cortex/support/TextControlFloater.cpp
@@ -156,4 +156,4 @@ bool TextControlFloater::QuitRequested() {
 	return true;
 }
 
-// END -- TextControlFloater.cpp --
\ No newline at end of file
+// END -- TextControlFloater.cpp --