Good,
a new HotFix is released for Visual Studio 2010, in this case aimed at solving some problems with Testing tools (if you did not know, friend Luis Fraile is a crack in this aspect). The detail of the solved problems can be found here (eye which is machine translation, so who better to give a look at the links at the bottom of the post).
Finally commenting that a prerequisite is the Service Pack 1 for Visual Studio 2010, do you still not have it?
Greetings @ Alicante
The Bruno
Source: http://support.microsoft.com/kb/2544407
Download: http://connect.microsoft.com/VisualStudio/Downloads/DownloadDetails.aspx?DownloadID = 36847
El Bruno 
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