Today I switched from a GeForce 8600 GT (nvidia-current 304.51.really.304.43-0ubuntu1) to an AMD Radeon HD 7750 (fglrx 2:9.000-0ubuntu3). After a reboot I noticed some graphic errors if I'm opening and maximizing a terminal. For example a part of the terminal is drawn into the panel and games have graphical issues too.

fglrxinfo returns:

display: :0  screen: 0
OpenGL vendor string: Advanced Micro Devices, Inc.
OpenGL renderer string: AMD Radeon HD 7700 Series 
OpenGL version string: 4.2.11903 Compatibility Profile Context
I get on glxgears ~7940 FPS so all seems to working fine here. Has somebody an idea how to get fglrx to work on Quantal?