title: What is this 'Waiting for Background operation' in Visual Studio 2012?
body: <p>Occassionaly, but fairly often, for no apparent reason, VS 2012 will lock up with a dialogue that says, "Waiting for a background operation to finish". E.g. this may happen during a plain old code edit, not on explicitly invoking any IDE command.</p>
  
  <p>What causes this, and is there anything I can do about this?</p>
  
  <p>I am running ReSharper 7, and I am not the only one I know experiencing this.</p>