Which app is this with?
This is in Illutrator. Since I posted the question -- as I try to isolate the problem -- it seems like it is not related to the use of UNDO. After I have run through my creation process several times, Illustrator just fails to continue functioning properly. For instance, I try to draw a simple rectangle with the regular GUI and a it fails to register. And when I view the document in OUTLINE mode, nothing shows up.
It seems the problem is related to redraw(), but I have included a redraw() at the end of my creation process.