The custom res problem (ie no 5040x1050) is now listed as an Open Issue in the Release Notes, only under Vista x64 and GT200 series cards.
GeForce 200 Series: When entering custom resolution values from the Manage Custom Resolutions page, the values are not validated. [524691]
It specifically mentions GT200 cards, maybe Custom Resolutions work on other cards and/or x86 Vista with evey card?



