title: Debugging session breaks with no breakpoint
body: <p>I have a large project that executes without problem when not debugging (even when running the debug build).</p>
  
  <p>If I try to debug the project, when execution hits a certain MS CCR dependent library the debugger pauses execution:</p>
  
  <p><img src="https://i.stack.imgur.com/REQci.jpg" alt="disassembly of source"></p>
  
  <p>The call stack at this point appears as follows:</p>
  
  <p><img src="https://i.stack.imgur.com/ipoZ7.jpg" alt="stack trace"></p>
  
  <p>This occurs even when "Debug"->"Exceptions..."->"CLR Exceptions" <em>thrown</em> <strong>and</strong> <em>user-unhandled</em> are both unchecked.</p>
  
  <p>The problem appears to be happening in <code>Microsoft.Core.Ccr.dll</code> at <code>Microsoft.Ccr.Core.TaskExecutionWorker.ExecuteTaskHelper(Microsoft.Ccr.Core.ITask currentTask) + 0x94 bytes</code> since I upgraded the project to .net4.5 and added the latest version of <code>Microsoft.Ccr.Core</code> (4.0.261.0).</p>
  
  <p>This is a major inconvenience to my debugging efforts as hitting these non-existent breakpoints means that other time-related parts of my project are almost impossible to debug correctly.</p>
  
  <p>What could possibly be causing this behaviour and are there any options I've missed that might allow VS to ignore the problem?</p>