Thread #616105 might help you.
I had a form that wouldn't clos because of a FOR EACH in a tree object (see message #646017)


>Usually to close a form I'll put Thisform.Release() in a close button. I have a form that won't respond to this. I can step right through it and the form doesn't go away. I've tried thisform.destroy() and thisform.unload() with no success. Why would a form not close?
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>TIA