The app closes for me fine (on Windows XP x64).

I've got a different issue however:


Got themes disabled on this install, so can't test if using a custom theme fixes the issue.

EDIT: I think I got the close issue.  Click "Create Bmps" then click the X button in the top-right hand corner of this new window.  Everything gets hidden but the app is still running.
The problem would be because you're hiding the previous window when opening the "Create Bmps" window, but not showing it again when closing that window (unless you use the Close button).  Try moving the "show form" action to the Unload event of the 2nd form, then change the Close button just to unload the form.
Alternatively, try using Modal windows instead :P
Hope that helps.

(This post was last modified: 07/02/2009 06:59 PM by ZiNgA BuRgA.)