Mac OS 9.0.4
Resolution 1152 x 870
Never had another Ambrosia title do this, but the first time quitting pop-pop scrambled all the icons on my desktop. Looks like the game hits the Finder at 640 x 480 -- repositioning everything -- before snapping back to my selected res.
There's a workaround, switching to window mode (Command-F) prior to quitting, but I'll surely forget that from time to time. Hope a better solution is practical.