Here is TeamCity 9.0.1 release with the latest fixes including those discovered in 9.0. Upgrade from 9.0 is highly recommended.
This is an easy upgrade for 9.0 as the data structures are all the same as in 9.0.
Download the build and upgrade.
The release is obviously timed to enter the next year without important known issues and relax at the New Year party :)
We wish you a happy New Year!
Have a great year 2015!