title: Visual Studio 2010 - "Hover over" no longer working
body: <p>I have a problem in the Visual Studio 2010 IDE, which hopefully someone can help with.  Basically I've lost all of the tooltips I had previously:</p>
  
  <ul>
  <li>If there is an error or warning in the code and I hover over it then nothing happens, i.e. no tooltip appears telling me what the error/warning is.</li>
  <li>If I hover over a variable then nothing happens</li>
  <li>If I debug and break the code and hover over the line where it is stopped I am unable to get the value of any of my variables.</li>
  </ul>
  
  <p>I've tried pressing CTRL+K,I and also using the toolbar item, but that hasn't made any difference.  I also can't find anything in the options which looks like what I want.</p>
  
  <p>This happens on all of my projects (all C# .NET 3.5/4) - I am presuming I've turned something off but no idea what it is or how to fix it!</p>
  
  <p>Any help appreciated.</p>