yesterday i installed Visual Studio 2012 Update 2. The install went fine but when i opened one of my project the debugger din't worked. The project was a Windows Phone 8 App. I tried to load the pdb file of my project through the modules window but VS told me that "a matching symbol file was not found in this folder" and i'm pretty sure that the file was right. So i tried again with another project, this time was a brand new WPF project. I just started the basic project in debug mode and VS told me that "the format of the PE modules is invalid". I got the same error in a Windows Store App.