title: Why WPF designer won't load
body: <p>I shut down my VS2015 last night. Start it today and my WPF form refuses to load in the designer:</p>
  
  <p><a href="https://i.stack.imgur.com/tHKfq.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/tHKfq.png" alt="Error"></a></p>
  
  <p>I have tried cleaning, restarting VS2015 and restarting the computer.</p>
  
  <p>What can I do? :(</p>
  
  <p>Update: I installed latest update and was still having issues.</p>
  
  <p>Then I killed the designer and ended up seeing an exception in the designer. It had an option to switch off using the code or something. So I unticked it. Then it opened! Then I traced my program startup and found an infinite loop! The way I had written it meant that on a Monday the loop woudl stop correctly - and it was Monday yesterday! Today being Tuesday caused my loop to hang.</p>
  
  <p>So I have fixed the code. But this means that the designer no longer shows dynamic content and I do not know how to switch that back on.</p>