found the root of my problem,
Installed intel chipset drivers as i thought it was a USB related driver issue, that didnt do anything at first, then i reverted to 197.16 mod drivers (from 197.25) that i initially installed when i formated the computer. The screen is perfect in rotate mode.
I dont get ANY corruption, as outlined in the documentation when in this mode. Hopefully this wont be a issue ever in future releases of the DL drivers on my sort of setup.
