Starting the ExtApp with revision 17776 and later leads to a program crash when the QmitkStdMultiWidget tries to open an OpenGL context (somewhere inside QWidget code). This only happens under Linux.
Revision 17725 of QmitkStdMultiWidget.cpp works.
Linux users can do a "svn update -r17725 QmitkStdMultiWidget.cpp" for a temporary workaround.
setParent by the initialization of the render windows. This works for the initial layout. but when you change the layout, it will still crash. We are working on a stable solution.
changing layout works now in windows and linux, by using a container widget encapsulating the renderWindow widget.
widget menu graphical artifacts fixed.
though the QmitkRenderWindow recognizes size changes, the underlying vtkRenderer doesn't, so there is still a preliminary workaround by resizing the renderwindow widget "manually" by calling resize(). This workaround has to be fixed using the standard QT layout system.