title: Search stops working for "Entire Solution"
body: <p>Somehow Visual Studio search has stopped working for me. Anytime I search "Entire Solution" for some text I get this result:</p>
  
  <blockquote>
    <p>Find all "[Whatever I was searching for]", Subfolders, Find Results
    1, "Entire Solution"   No matching text found to look in.   Find was
    stopped in progress.</p>
  </blockquote>
  
  <p>Why does it suddenly say "No files were found to look in"?</p>
  
  <p>I've found a number of links on Google that say to press <kbd>Ctrl</kbd> + <kbd>Break</kbd> or <kbd>Ctrl</kbd> + <kbd>Scroll Lock</kbd>, but none of them seem to work for me.</p>