Interesting issue that we ran into with MAS 200 SQL 4.45, a customer created several custom Crystal reports and added them to the Custom Reports menu. Some of the reports prompted for a user id and password every time they ran them and others did not. The culprit was dynamic parameters. We changed those parameters back to static and the problem went away.
I haven't tried to duplicate it in 4.5 SQL but I'd be willing to bet it's exactly the same.