I think the Contrast issue is with the N800 (perhaps 770 but I don't have one).
I have to second the no-Map mode. It would probably be better than the bitmapped graphics that become as the program attempts to blow up a diffferent map. I think that may also help with stability as each time I've crashed the program it has been when it has tried to load a map it didn't have. Poof! Gone!