visual bug with OpenGL application
When an OpenGL application that uses an RGBA context is used, any Qt-based application will have visual artifact.
You can for instance reproduce the bug by running Cairo-dock2 with opengl backend (cairo-dock -o), then running either
ooffice packaged for KDE
you will probably get a transparent window (borderes are displayed, but not the content of the window)
It is independant of the WM (Metacity/
It occures with any version of Qt available in the Ubuntu repositories until now.