2.1a and b cause hang with Test Explorer


VS 2013.2RC

I have a solution w/ python projects in it and about 180 unit tests (MSTest)

When I show all the UTs in Test explorer and run the scroll bar up/down the list, VS hangs completely. I did a bit of troubleshooting disabling other extensions, etc and nothing solved it.
I had 2.1 alpha installed, and thought I would try upgrading to 2.1 beta. Still no change.
Finally I uninstalled PyTools altogether and the problem went away.