Sorry for your troubles. Let me see if I can help you out. Can you start by confirming that the unhandled exception is not caused by the monitor instance being null within your own code? I'm not terribly familiar with the page lifecycle for Phone applications but if the Loaded event is somehow not fired then the Close event will try to reference a null variable. Perhaps you should guard the code in your Close event handler with a null-check and see if that fixes the issue?
If it does not fix the issue, I'd appreciate a as much of a stacktrace (including inner exceptions) as possible in order to determine where the error may originate.
Looking forward to hearing from you.
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