title: Xcode: variable dialog on hover not working
body: <p>I'm using Xcode 6 (Version 6.1.1 (6A2008a)) and I find the dialog that usually pops up when you hover over a variable in Xcode (just before your breakpoint) incredibly useful.</p>
  
  <p>However sometimes this dialog won't appear.
  Is this a bug with Xcode or are there reasons why it sometimes won't appear?</p>