John,
My suggestion is to go to recent levels of the various products.
RBD supports up through WAS 8.5.5, the latest levels of CICS, and COBOL V5.1. We ship CTG V9.0.0.2 with RBD for development purposes.
The latest RBD release is RBD 9.1.1, so would suggest you looking at that.
Anytime you upgrade and use generated COBOL on CICS, you should make sure the Rational COBOL Runtime product (i.e. EGL COBOL runtime) is upgraded to the latest PTF level. This is found on the RBD fixlist page in the zSeries PTF list tab
Mark
markevans