Mandrake 9.1 flashing...
 

I'm running Mandrake 9.1 and when I open som windows such as mozilla, thunderbird and control center (others too) the start flashing (not showing anything but the frames) until I move the window with the mouse. At first I thought this was due to me not having installed the nvidia driver (but thanks to boftron's artricle that's all done).

Anyone else had this or... :confused:

anyone?