Steps to reproduce:

1. Start VS 2012 and load the test ui project.
2. Start new test from the test explorer window.
3. Wait it to finish.

Actual result: the test is green but the browser is not closing. Even if you manually close the browser all dialogs on the machine are closed by the TS engine. Only restart fix the dialogs problem.

The used browser is IE9.

The problem was reproduced on 2 machines.