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Interrupt Variable Inconsistent Operation

Other Parts Discussed in Thread: TMS320F28335

I am having problems getting the TI TMS320f28335 to run consistently. I am using the ezDSP from spectrum digital. I have a test program that initializes the chip, configuring the ADC and setting an interrupt using the EPWM1 timer. In my interrupt I have a variable 'test' that I increment and I watch it in a window. As expected, when I run the program 'test' increments. I then stop the program and restart it and test will no longer increment. Many times it will work fine for a while, and then it breaks again. The system doesnt crash, it just stops entering the interrupt.
I am using code composer studio 3.3 with Windows Vista.