I have a TeamCity 7.1.5 instance with 6 projects and 11 build configurations. I did not checked it for a quite long time ago, because this server builds my private projects and I didn't have time for them. Before this gap, TC built projects after every git push, but now it does not happen. The last successful auto-triggered build is happened at 2012 Nov 25.
All build configuration has a VCS Trigger, and these triggers are active, not disabled.
This TC server has 3 build agent, itself, one Windows and one Linux agent. If I click on 'Run' button, build happens as normal, so build agents are OK and healty.
My projects are basically Ruby projects, I use RVM and Bundler to build them. But again, no problem in the build process, if I trigger it manually, it works as expected.
I am relative new in TeamCity, so please tell me what information you need to help.
TeamCity version: TeamCity Professional 7.1.5 (build 24400)
Java version: Java(TM) SE Runtime Environment (build 1.6.0_31-b05)