Finding out what changes a custom property

[Paul Dupuis]

I have a stack with a custom property, hrStart.

Somewhere is miles of code and messages flying everywhere, something is 
changing it that shouldn't.

Is there an debugger feature or tip or trick anyone has that can do teh 
equivalent of set a break point when a property is changed and let me 
see the executionContexts to tell what the heck is changing it!

Thanks in advance,