There are three versions of RSRDC, which are
not interchangeable and the differences are
not cosmetic. RSRDC v550 is for stock SH4 v1.5. RSRDC v502 is for TMO v2.5. RSRDC v575 is for RFB v2.0. Each version of RSRDC is compatible only with the indicated supermod, and must be installed after the supermod. Failure to do so will cause major in-game misbehavior and/or CTDs. I can't say for sure, but it sounds like that could be your problem.
Get all three versions of RSRDC here:
http://www.subsim.com/radioroom/showthread.php?t=123467
Good luck!