Peter,
As you tell more about your problem, my suspicion turns to the PSC module. The McASP may be one of the many modules that must be enabled from power/clock off condition.
If you are using our EVM, there is a GEL file that comes with it that includes code for enabling everything in the device. If you use that GEL file when you bring up your EVM board, you should have everything enabled. If you do not have the GEL file, you may need to contact the board vendor to see if they will provide it to you.
Why are you using such an old version of CCS for a new product? I recommend you upgrade to CCSv5.
Regards,
RandyP