Visual Studios Unit Tests passing locally, "Not Executed" on build server

I am currently running into an issue with Unit tests passing locally, but getting reported "failed" test cases on our build servers. Locally, I am running win7 VS2013 test agent and the build servers are running win8 VS2013 test agent.

Firstly, all our tests are passing on our local machines, so we are having trouble reproducing the problems on the build server. Secondly, on the build servers, the tests are reporting that they aren't being executed, but based on the console output as well as some coverage information reported, we can see that the tests are actually running (which is a mystery to us).

We have attempted the tests locally and all our local machines will pass, but all our server machines will not pass certain tests. Also we have attempted to rollback to a previous state on the build server that was passing, but even that has not worked. We have already attempted a clean build/rebooting of the build machines, but nothing has helped so far as the tests are still reported as "not executed" (console outputs suggest that it is running since our debugging information is being printed). The tests are running in parallel on the build server, but that shouldn't be an issue as it was running fine before.

anyone running into this issue or have a solution or a suggestion on where to look?

-L