title: PDBNavigator fails although there are pdb files
body: <p>We are developing a small framework within the company and there is a small weird issue with pdb files.
  While developing framework, we also commit pdb&amp;dll outputs and related projects are referenced directly to these dlls. </p>
  
  <p>But when i build and commit these dlls, my companions cannot navigate to sources of framework. When someone else builds, i cannot navigate to source.</p>
  
  <p>Only thing i can do is to use resharper's navigation via "navigate to -> decompiled sources".</p>
  
  <p>There is something wrong i think. They are the same files so that i should be able to navigate to their files directly.</p>
  
  <p>Btw, we do not version framework. All dlls use same 1.0 version.</p>
  
  <p>Anyone having an idea?</p>