Kevin,

> This works, except on Windows where the window mysteriously shrinks
> by several pixels in the vertical when re-started.

I believe this problem was fixed a some time ago. Please grab the latest
VM (http://isgwww.cs.uni-magdeburg.de/~raab/squeak/SqueakExe.zip) and
check to see if it goes away. If not, please let me know.

Cheers,
  - Andreas