Since the install of Ubuntu Desktop 10.10, any launched programs shows up without a windowborder.
I update daily, but the problem remains. Until now I found only one "remedy" that fixes the problem (until the next reboot). This "remedy" is not logical to me and is something I just stumbled upon.
On the desktop I choose with a right mouseclick for the option 'Change Desktop Background'. When this window popsup I choose the last tab for 'Visual Effects'. Then I choose any of the options other then 'normal'. The program starts looking for a driver, but fails to find any. At the moment the program reports this back to me.... surprise......all the windowborders are visible and stay that way until I reboot.
I can not explain this, but I would like to find a real and permanent solution to this problem.