This has been observed on a Macintosh LC and IIfx, and on PowerBooks.
Crashing has not been reproduced on the Macintosh IIsi or Macintosh
Classic, nor on any of the pre-IIfx models, though potentially these may be
a problem (particularly with third-party video cards).
The crashes do not always occur in the situation described above, and may
vary with the system version. It may also depend upon the amount of card
area that's not showing through the card window. The best reproducibility
occurs when your card rect is very tall (taller than the monitor) and the
card window is smaller than the card rect.
This article is adapted from the Claris Tech Info database.