I too use the hi-res mod and it does improve the graphics even at 1280x1024 which I have. As for screenshots, never had a problem, but you need to hit the "print screen" key rather than the "F" numbered key (can't remember which F number it was now) and specify where you want screenshots to be saved when you set up the mod.
Nemo
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"I'm afraid there is no disguising the fact that King's obsession with the Pacific and the Battle of Washington cost us dear in the Battle of the Atlantic".
Sir John Slessor GCB, DSO, MC, DL
AOC-in-C Coastal Command RAF
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