One of the best sources you have at your disposal is your Lotus/IBM sales and system engineer rep. We go to ours all the time and he's our champion ... we can send him a question, a bug, a request, a gripe and he forwards it up the chain. Sometimes they go unanswered and sometimes you get an answer back. I noticed you are using "release candidate." I didn't try to repro your bug, but why not upgrade to the gold version ....
Lotus Certification Practice Tests for ND6, Collaboration and R5