I also have this problem: Window Descorations are missing after every reboot.
The problem appeared after some update.
I have an ATI On-Board Card (Radeon HD 4200) and I am using the ATI Driver
provided by Ubuntu. However, this seems not directly related to the dirver as I
can deactivate it and the problem is still there. Also, als ArgelBargel says
the problem occurrs with nvidia cards as well.
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missing window decorations after reboot
https://bugs.launchpad.net/bugs/408764
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