TeamCity 5.0.2 contains a lot of fixes. Everyone is encouraged to upgrade (but don't forget to make a backup!).
Release notes: http://youtrack.jetbrains.net/releaseNotes/TW?title=TeamCity+5.0.2+Release+Notes&q=fixed+in%3A+%7BDarjeeling+5.0.2+%2810784%29%7D
Download link: http://www.jetbrains.com/teamcity/download/index.html
In a week or two we hope to open TeamCity 5.1 EAP.
The JetBrains TeamCity Team