I'm using 5.0Rc1 on centos4 and have had the following things mysteriously stop working in the admin console during the upgrade:
- MTA/spam/virus status aren't updating. The graphs get re-generated, but no new data's getting in (so, flat-lines on the graphs). Disk usage still seems to work, so RRDtool is okay.
- Mail quotas no longer show in the appropriate monitoring tab, only "There is no mailbox on this server."