It's hard to tell when BES isn't communicating with the database. You can look in the computer's Application log for Blackbery errors, but I have had to uninstall SQL 2005 Express and reinstall to get things to work. If you only have one license, BES doesn't like it when you delete and add a single user. I would do a complete restart of the server computer just to be on the safe side. Sometimes shutting down and restarting all the Blackberry services and the SQL database by hand works. Turn on SQL first, then all the Blackberry services - no particular order if you're using the latest version of BES. Sometimes only voodoo can get BES to work.