In the WPFPerf Performance Profiling Tools for WPF 4 is now available! post, I mentioned that a bug caused the Visual Profiler to not display any data in certain time zones.
A patch is now available to fix this issue.
To install the patch:

1. Install the WPF Performance Tool like you normally would by installing the Windows SDK for Windows 7 and .NET Framework 4 (Windows SDK 7.1)
2. Install the patch from http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=da041972-1eb6-4a8a-97d7-d495b314505e
3. When you get to this dialog, click on 'Repair' 
    
4. On next dialog click 'Repair' again.