I'm seeing sporadic (inconsistent) errors when running the unit tests we have in s-ramp. Note that many of our unit tests fire up the full s-ramp repository and then do some actions (add content, query, update, etc). When I run the tests on Windows I have recently begun seeing the following two Exceptions pop up from time to time:

https://gist.github.com/EricWittmann/81b90d6c6f2eafd4cdd1
https://gist.github.com/EricWittmann/85ecc15a02e1cf25520c

It doesn't always happen on the same tests. It's not always the same error - but I've only seen these two variants. All tests seem to work when I run it on Fedora.