I love the product. Here's something to work on:
It appears your unit testing solution is creating a shadow copy of the assemblies to C:\Documents and Settings\[user]\Local Settings\Application Data\assembly
I am testing with one assembly on another assembly. I first make the test fail. Then I change the code in the other assembly. When I run unit tests (under any NUnit solution by the way), it doesn't seem to copy the latest dependant assembly to the shadow copy and thus I get stale debugging and inaccurate results. Here is a link that explains this further:
As a workaround, I deleted the assembly folder and it refreshed it ok the next time around.