The latest couple of CVS versions of XEmacs 21.2 (beta32) seem to have a
problem with the pop-ups. The problem is that a box will pop up with a
question like "Do you want to save such an such ?" when you press
"%_yes" (which is what the button currently shows ?) all that happens is:
(1) The pop-up goes away.
(2) XEmacs beeps.
(3) A message appears in the minibuffer requesting that you respond to the
now non existent pop-up.
(4) XEmacs now just beeps at you, you can't type, quit, anything.
I've tried using Motif and Athena dialogs/widgets with the same results so
this is not a Motif/Athena problem.