ImageHeight Bug with ATI ??

Blitz3D Forums/Blitz3D Bug Reports/ImageHeight Bug with ATI ??

I have here a funny thing.
I get a Memory Access Visulation Error here

menu = LoadImage ("menu.png") >> no Error !!
MidHandle (menu) >> no Error !!
MaskImage (menu,255,0,255) >> no Error
High=ImageHeight (menu) <<< crash !! Error Memory Acess Vis.... why ????

this Problem exist only with a ATI Graphic Card X800 512 MB, WindowsXP and DX 9. Other Graphic Cards works fine.

where is the fault there?