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USB out seeming to affect system stability

Latest version of TI-RTOS.

I'm seeing some anomalous behavior when I have a lot of USB output.  I'm trying to use the USB to log debug output as the JTAG interface has proven to negatively affect the response to interrupts when running interrupt-heavy tasks (this application runs a brushless DC motor to open/close a security gate).

I'm only outputting data when the motor isn't running, but it appears as if trying to send data too quickly will cause weird output errors, like corrupted characters.  
I also sometimes see watchdog resets during heavy output, which seems weird.

I don't see any places where interrupts are disabled in the USB code, so maybe this is a red herring.

All help appreciated!

Ed Averill