Hello,
I encountered a bug while porting my code from 2014.10 to 2015.05.2.
Incriminated lines in file "Plugins/org.mitk.gui.qt.imagenavigator/src/internal/QmitkImageNavigatorView.cpp", function "QmitkImageNavigatorView::SetBorderColors" :
208 QmitkRenderWindow* renderWindow = m_IRenderWindowPart->GetQmitkRenderWindow("axial");
209 QString decoColor = GetDecorationColorOfGeometry(renderWindow);
210 if (renderWindow)
211 {
(and following calls to GetDecorationColorOfGeometry in the same function)
In my custom editor, I removed the 3rd window, named "coronal". The GetQmitkRenderWindow return a nullptr, and GetDecorationColorOfGeometry try to access it without null check.
The fix would be to either move the call to the function inside the "if(renderWindow)" section, or add a nullptr check in GetDecorationColorOfGeometry.
AFAIK, the bug is still present in the latest git commit (4d544bec0b86f7780021ce5dfcc8d66ccb2cdd5c).