I came across an interesting issue while trying to run some MbUnit RowTests this morning.
Namely, it seemed that the rows being passed in contained all null values. It left me scratching my head. I ran the tests using MbUnit console and it worked fine but didn't work as expected from TestDriven.NET in VS2005.
Well, it turns out that (I think) the install for MbUnit does not create the requisite registry keys in an x64 environment. It properly creates the keys under the Wow6432Node, but it does not create the keys under the path:
So to make it work, all you have to do is to copy the string values from the Wow6432Node to the key above and restart VS.
Hope this saves some headaches for other developers working in an x64 environment!
Update: Jeff Brown notes in the comments that this should be fixed with future releases so that x64 environment registry keys are properly generated.