We've just published a bugfix update for TeamCity: version 5.1.4 (build 13550).
This release contains fixes for various issues uncovered throughout the system, and introduces minor improvements.
Please consider upgrading especially if you use TeamCity with Subversion, Git, EC2 cloud agents integration, RSpec 2.0 or Visual Studio add-in.
This release also adds transparent reporting for tests run by Maven Failsafe plugin.
See the full issues list in our tracker.
Get it from the official download page.
If you like living on the cutting edge, consider upgrading to TeamCity 6.0 EAP build which contains lots of improvements and new features over TeamCity 5.1.x.