I have not found why using pGbuild after choosing soemthing on the list in the "large list" example causes a crash. I am using FB3 rel 7 with a Program Generator Project. This does not use the Appearance runtime (not compatible with Program Generator). 

I side-stepped the problem by making the windows type NVIS and build on startup (invisibly). then I use "WINDOW # _windowconstant " to make the window appear and "WINDOW # - _windowconstant" to close it. One window needed a "CLS" on activate ot else the background would not draw. 

<<I have the same problem in the same location, I think it might be to do with
the number of parameters in WINDOW for Appearance as apposed to Basic
Runtime. My program has 23 windows which can be open or not as the user
requests. It runs fine in 9.2 and sometimes in OS X but other times it just
crashes. I'm sure it is overwritting some memory location but i'm having a
hard time working it out. also all of my windows are resource based, I only
have somuch time available out side of running my company.
Please post if you figure it out before me
Regards
Triple Pete >>