DX9+AA screen resolution issue?

Hey all,I'm hoping someone might have any insight as to whats creating an odd issue for me.If I use DX10...both windowed and full screen work just fine, yet if I switch to DX9 fullscreen, it only displays the top-left quarter of what should be the overall picture. It will display correctly in a window. Disabling anti-aliasing is the only cure, but I just can't deal with the jaggies.I've tried a fresh fsx.cfg to no avail, widescreen=true, various other resolutions, hell...just about anything else I could think of. So I'm wondering if this could be some odd hardware setting or cfg tweak that I've overlooked. All my drivers are up to date.System:Intel C2D8500Nvidia GTX2804gig RamVista Home (64)Any assistance would be greatly appreciated!