I have the same problem!
Very annoying considering how much the device is - this is the only negative that I have about it.
HTC Blackstone - now I can truly say an amazing WM device! If we somehow get properly optimised video drivers then even better.
HTC Blackstone (In use)
HTC P3700 - HTC Touch Diamond (In use)
HTC P3600 - Black HTC Trinity (Dead and buried)
Toshiba Portege G900 '800X480' Display - big as fcuk and ugly! - (Murdered)
XDA - Exec - (Dead and buried)
XD2i - (Retired)
XDA - (Retired)