Its a common problem, the jreceiver yahoo group has lots on it. For Linux, Most likely something to do with the users in the Mysql database (not the jreceiver database).

I've successfully failed on numerous attempts to get passed that bit, on W2K though. Don't use jreceiver anymore because of it.

bill,
(6 rio's, trio alpha 5, ARM 1.04, streamsicle 2.0)