I have an simple app in which I have a button that I've attached a function to the Activate callback. The first time I 
press it it runs fine. However, the second time I press it, the app craches with a SIGSEGV error. I peppered a few 
printf statements in the callback and it never even makes it into the callback the second time. 
    What is most strange is that I developed the app on a WIndows-based pc on which I am running QNX4.25 under VMWare 
and I don't have any issue running on that. Only when I copy the app to a machine running native QNX4.25 do I get the 
error.
  First off, anyone have any idea why such a seemingly simple operation would cause a SIGSEGV? I have 100's of instances
 like this in other apps and have never seen such a thing before. Also, anyone experienced a similar problem and/or know
 why there would be different behavior between the two environments? i.e. why does it run fine when QNX is running under
 VMWare vs. crashes consistently on a native QNX machine?