I was using xUnit 1.1 with Resharper 4.5 so far. Today I decided to upgrade to xUnit 1.5 with the same Resharper version. I followed the instructions to integrate the two of them.
Previously unit tests used to run in the default output folder of my project (bin\debug\...). Now they run in a temporary location ('C:\Users\<user>\AppData\Local\Temp\ba7ba69e-64be-46be-ad18-6b929f75.....).
Resharper>Options>Unit Testing>Shadow-copy was and still
is not checked.