Nah, it's not my monitor. the resolution is fixed at 640x480 and it works properly with all other output modes (tried surface, opengl and ddraw).

Whenever I run DOSBox in full-screen mode, there seem to be pixels missing from the bottom of the screen. The display is truncated by 1 scanline without aspect ratio correction or what does indeed look like 1.2 scanlines with aspect ratio correction enabled. This happens only when I use overlay …

Just wondering: do you also get a lot of flickering while running this game? It's probably not DOSBox' fault, since I also get it when running with VDMSound. Quite annoying, though.