title: Excel TFS Add-In Crashes Connecting to TFS
body: <p>We frequently use Excel to perform bulk updates of data in TFS. Up until very recently, the Team Foundation Add-In has worked very well. However, it has started failing in several ways:</p>
  
  <ul>
  <li><p>It will connect to the server, but attempting to connect to any
  project causes Excel to crash, producing a Watson report in the
  Windows Application Event Log.</p></li>
  <li><p>If I restart Excel, it reports that it is running into problems with
  both the shim and the add-in, and offers to disable it. If I do not
  disable it, I still can't connect to a project.</p></li>
  <li><p>Eventually, the add-in refuses to load at all, until I use the
  Options dialog to manually add the COM add-in back into the
  application. Doing so produces the same results (Excel crashes when
  attempting to load a project).</p></li>
  </ul>
  
  <p>I have taken the following steps in an attempt to resolve the issue:</p>
  
  <ol>
  <li>Removed and completely reinstalled Office. </li>
  <li>Re-registered the add-in component.</li>
  <li>Uninstalled and reinstalled Team Foundation Office Integration.</li>
  </ol>
  
  <p>None of these have produced a fix to the issue.</p>
  
  <p>Does anyone know how to resolve this issue?</p>
  
  <p><strong>P.S.</strong> If this is not the correct "stack" for this question, kindly point me to the correct one on the exchange. Thank you.</p>