title: Visual Studio 2010 Improperly underlining code/comments with red error line when there is no error
body: <p>I am working on a rather large project, and I am having strange problems with the IDE in terms of error checking and somewhat with IntelliSense.</p>
  
  <p>Usually if I were to type something boneheaded, like "int a = "aa";", it would underline "aa" in red. However I am seeing VS do this to random parts of my code when I make insignificant changes.</p>
  
  <p>For example:</p>
  
  <pre><code>/*
       Some comment here, just going to stretch it out for my example..
  */
  
  int proto1();
  int proto2();
  </code></pre>
  
  <p>If I make changes to other parts of the project, sometimes random functions will get underlined, and even <em>part</em> of a comment. Like just 30 minutes ago it underlined the equivalent of half of that comment beginning in the middle of the word "comment", also it underlined all of int proto1(); and part of int proto2();</p>
  
  <p>I would post screenshots but I am bound by contract not to disclose any work, and I can't easily replicate it in smaller projects.</p>
  
  <p>I don't understand why it does this. When I compile the project, any fake errors and underlining it did goes away and it compiles fine. The point though, is there are <em>no</em> errors. It's making up random errors and underlining random lines/words/half words. I would also like to note that there seems to be a large delay in loading new intellisense information, almost by 2-3 minutes or longer.</p>
  
  <p>I'll try and reproduce it in an unrelated project and post here if I can. However, any help would be appreciated.</p>
  
  <p>Thanks!</p>
  
  <p>*Edit: Forgot to note that hitting the space key several times will on occasion correct the errors however this isn't reliable and does not always work.</p>