In the workbench, switch on volume rendering in properties view, then uncheck the useGPU checkbox => crash:
gdb> backtrack full> !41.736! [VtkGenericWarning] WARNING: Generic Warning: In /home/mhettich/MITKsuperbitch/ep/src/VTK/Rendering/Volume/vtkRayCastImageDisplayHelper.cxx, line 20
..> Error: no override found for 'vtkRayCastImageDisplayHelper'.
Core was generated by `./bin/MitkDiffusion --BlueBerry.Clean'.> Abort (core dumped)
Program terminated with signal SIGABRT, Aborted.
...
Error: no override found for 'vtkRayCastImageDisplayHelper'.> 134
MITK Version is the master-branch as of 2016-10-05 (today).
So I think we need to define a default case in the Module
andor make sure exactly 1 checkbox is selected there (Does Qt have radiobuttons?) in the Plugin or GUI.