MSTest ExpectedExceptionAttribute problem

We have a project that had unit test written with NUnit. We moved it to a TFS environment

which made us convert the tests to MSTest. In 4.5 this was a seamless change

in the context of the R# test runner. R# 5.0 (1570) all the tests that used the ExpectedExceptionAttribute failed using the R# runner.

I had to move back to 4.5

A wrinkle to this might be that I am using NUnit inside the MSTest unit tests. But this arrangement has been working fine until R# 5.0.

I am having the same problem as the OP in this thread but with 5.0, not 4.5: http://www.jetbrains.net/devnet/thread/281286