title: NuGet fails to find package if it's not in Cache
body: <p>I have an internal feed setup for NuGet.  When I try to build one of my projects (via a TFS build server), I get an error that NuGet cannot find version xxx of package yyy.</p>
  
  <p>I go to the NuGet package folder on the server and the correct package/version is there.  However, the package/version does not exist in the NuGet cache folder:</p>
  
  <p>C:\Users[user account]\AppData\Local\NuGet\Cache</p>
  
  <p>If I copy the correct package/version to this cache folder, then the build succeeds.</p>
  
  <p>Any ideas?</p>