We have a barrage of (nunit) unit tests in our solution, in order to differentiate the long-running performance tests or integration/system tests that consume external resources many of them are categorised as "Performance" or "External Dependency". The reminder, the genuine Unit Tests, are left uncategorised.
In the unit test explorer, I can see the three category choices when selecting to group by Categories, but when I right click on the "<Uncategorized>" options and run selected tests, the resulting session will include some tests which are categorised with one our two named categories.
This wasn't a problem in 5.0, but is an issue in
JetBrains ReSharper 6.0 C# Edition
Build 6.0.2202.688 on 2011-06-29T20:14:16