Hello Phaelz,
I managed to get it working with the msp430, and recently with the Stellaris (much easier thanks the driverlib). Anyways, if you post your email I will send you my msp430 code which used the grace plug in.
Also, as a general note I've found that the debug circuit doesn't do well with any type of external communication. My suggestion is just use either the run to line command, or the reset button itself. (don't step through)