Recently I downloaded (from 2D Boy) the Linux deb package for the World of Goo Demo. Also, my child played an old Windows 98 game under Wine. In both cases, after exiting the games, the screen resolution stayed large. In the case of World of Goo, I couldn't get to the menu button (out of Desktop area) to get to Display settings to change it back to default, but logging out and back it worked (ALT+F4).
I'm not sure if this is fixable...(having it automatically revert once a program quits).
Yes, I googed, and searched the forums.