I've had the same issues with the latest drivers. I'm on Catalyst 7.9 also. I can only hope the situation will fix itself when ATi releases more drivers.
On a side note, with anything after Catalyst 7.4 or so, I can't get any windowed OpenGL application to render anything as long as it is on my main monitor. It renders properly when I start it in fullscreen (no alt-tabbing!) or drag it to my secondary monitor. If I switch the primary/secondary roles for my monitors, OpenGL renders properly on both monitors. I have no idea what causes this.