:UPDATE: Happy to report that amd's 11.6 drivers seem to have fixed ALL issues I was having. The only problem i had was removing the 11.5 drivers... had to use driver sweeper to fully remove them. I read others were having the same problem for anyone using these drivers. I knew they weren't removed properly because my resolution wasn't changing down after removal as well as the terrible performance once the new ones were installed.
Yep, had the same issue when using the ATI Catalyst Driver Manager program to uninstall the 11.5 display driver....... once it un installed my screen res dropped back to like 800 x 600 from 1920 x 1080... but when the PC was rebooted I was back in 1920 x 1080 res automatically....
what I did to fix this, was I went back in and completely uninstalled all of the ATI Catalyst Manager & all other AMD/ATI drivers............ then it worked properly ( I did not have to use a 3rd party Driver Cleaner program )
then I installed the new 11.6 drivers that are for my OS: Windows 7 64 bit ( btw: the new Driver Manager picked up on and noticed to offer all the AMD/ATI drivers I deleted/removed when uninstalling the 11.5 drivers, and other AMD & ATI drivers..... so I just marked the check box of which ones I wanted to include on the fresh install update )
also was having the same abnomallys regarding the f4u-1 and flickering with the 11.5 drivers ( which I got from XFX )..... I downloaded and used the 11.6 drivers from AMD/ATI website.......... all is well and looks better/performs better also

hope this helps
<S>
TC