Unit test fail

We recently upgraded to resharper 8.0.1 and out unit tests started failing. The simptoms are very strange. If I right click on my unit test project and select "run unit tests", some unit tests will fail (always the same ones). If I go to the "Unit Test Sessions" window, and right click on the top node (which corresponds to all the tests in my project) the tests pass just fine. Also if I use MS Test  all test pass just fine.
Any idea what am I doing wrong?

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