Bizarre mouse action when testing room.

[Peevish]

Doing my AGS game, more of a quickie demo, working my way through the first tutorial. I've designed my first room, saved everything, and selected "test game." For some reason the cursor is mostly hugging the edge of the screen, often moving in the wrong direction, and generally being very strange, like the mouse is moving far too fast for the computer to keep up.

I am running AGS on a Mac, emulating Windows 2000 with Virtual PC. Is AGS just bogging down my RAM too much? AGS doesn't strike me as a particularly memory-intensive program, but with the emulation and the other OS it can really slow things down. Any ideas on this are welcome.