I tried this out with Warcraft III and I experience the same issue with ratpoison as my window manager.This doesn't occur with other games, though, so it's probably an issue with W3's window mode.I also found that if I start with a higher resolution "1600x1200" for example, then switch to a lower resolution "1280x960" then the missing area at the bottom of the screen is gone, but only with lower resolutions than 1600x1200.The highest resolution doesn't matter, though, as if I start with 1280x960 the game will only display correctly with resolutions lower than that. As a hacky workaround, and assuming your monitor supports it, you could try setting a resolution higher than 1680x1050 and then switching back to it after starting the game.
