From: Brian B. on
I'm having a similar problem, if not the same, with R2009a. When I open older GUIs that I created and try to edit then save them, and even when I try to save a newly created GUI, I get something along the lines of the following error:

"Unhandled internal error in guidefunc:

Attempt to reference field of non-structure array.
Error in ==> guidefunc>getGuiStatus at 569
Error in ==> guidefunc>saveBeforeAction at 2473
Error in ==> guidefunc>layoutSaveAs at 1489
Error in ==> guidefunc at 123
Error in ==> guidefunc>layoutSave at 1192
Error in ==> guidefunc at 120"