Bug (I think) limit on popup menu strings

I working on porting some lisp code from Emacs to XEmacs. One area I'm having a problem in is with a certain popup menu. It works ok on Emacs but crashes XEmacs. I think it has to do with the length of the strings being put into the popup menu. I'm been able to come up with a simple snippet of lisp code that can recreate it. It would appear the magic number to make it crash is 64 characters. I see that popup menu is in the c-code and I get lost in there pretty quick. anyhow, here is the test case: (defun popup-menu-2 (e) (interactive "＠e") (let ((menu (list "" ["Crash" (crash)] ))) (popup-menu menu))) (global-set-key 'button3 'popup-menu-2) (defun crash () "" (interactive) (let* ((menu (list "" (format "%s" "1234567890123456789012345678901234567890123456789012345678901234" )))) (popup-menu menu) )) This one WILL crash, at least for me. Delete the end character (4), and it will work. jeff