title: Incorrectly highlighted code errors
body: <p>I have just opened a solution that builds with no errors, but nearly every line of code, in every class, in every project, shows keywords, type, and method names in red, as if none at all of the referenced assemblies are present. E.g:</p>
  
  <p><a href="https://i.stack.imgur.com/0rdnQ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0rdnQ.png" alt="enter image description here"></a></p>
  
  <p>When I first open the solution, everything appears fine, and then a few seconds later, everything looks like this.</p>
  
  <p>I am using VS 2015 Update 3 with ReSharper Ultimate 2016.2. I have a host of other little extensions, but , as far as I know, nothing knew, and I have only experienced this problem temporarily before, e.g. only on the first time I open the solution.</p>
  
  <p>I have just repaired ReSharper with no change, but have deferred the lengthy VS repair process to first see if I can find anything out. </p>