GanZ,
This is a very unusual error message and it may require further investigation. Could you send the versions of both the TI Emulators and the Spectrum Digital Emulators components (menu Help --> About Code Composer Studio --> Installation Details)? Also, can you capture the Debug Server log by going to menu Help --> CCS Support --> Enable the Debug Server Log and repeat the entire procedure - i.e., launch the debugger, connect to the core and then open the UART0 register view? This using the XDS510 configuration.
I imagine this also happens on a C6657 EVM (the closest device to a C6655), is that so? Unfortunately I can't try to reproduce this here as I don't have a proper adapter between my XDS510USB's 14-pin connector and the C6657 EVM's TI 60-pin emulation connector, but the logs above will help.
Another detail is that, close to the holiday break, some folks are about to leave for vacation (myself included), therefore it is possible that a definitive solution will probably happen only next year. Hopefully you can get by with the 560v2 configuration.
I apologize for the inconvenience, but in any case I wish you happy holidays.
Rafael