title: Xamarin Studio code completion and navigation not working
body: <p>Yesterday I upgraded Xamarin Studio on my Mac <code>(10.12.4)</code> to <code>6.1.5 (build 0)</code> community edition.</p>
  
  <p>If I create a new project, everything works as expected, but in my existing solution that is quite extensive, code completion, symbol navigation <em>(e.g., right-clicking a symbol to find references)</em>, and brace matching are all not functioning.</p>
  
  <p><strong>Note:</strong> It seems to be functioning properly in XAML files, but not CS files. This is strange, since everything I could find searching appears to suggest the opposite is the most likely circumstance.</p>
  
  <p><strong>Here are the things I've tried so far to remedy it:</strong></p>
  
  <ul>
  <li>Removing and reinstalling Xamarin Studio</li>
  <li>Deleting all Xamarin-related files from <code>~/Library/</code> and <code>~/Library/Caches</code></li>
  <li>Turning off the related settings, then back on</li>
  <li>Restarting my Mac</li>
  </ul>
  
  <p>It may be worth noting that in the area above the text editor, I see the following 'no selection' message, no matter what I do in the file:</p>
  
  <p><a href="https://i.stack.imgur.com/oL0Iz.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/oL0Iz.png" alt="Xamarin autocomplete broken"></a></p>
  
  <p>and if I select a symbol, the menu is always greyed out:</p>
  
  <p><a href="https://i.stack.imgur.com/9dowt.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/9dowt.png" alt="enter image description here"></a></p>
  
  <p>I have not seen anything that appears to be relevant in the IDE logs, and I have tried everything I can think of at this point.</p>
  
  <p>Does anyone out there have any suggestions on what to try next, or how to debug this issue?</p>
  
  <p>Lastly, on another Mac with the same version of Xamarin Studio, I am unable to reproduce, and we're both pulling from the same git repo.</p>
  
  <p>Thanks in advance.</p>