title: po command in Xcode does not generate output
body: <p>At some point during my work, Xcode's <code>po</code> and <code>p</code> commands stopped working. No matter what I enter, it doesn't generate output:</p>
  
  <pre><code>(gdb) po self
  (gdb) po [self name]
  (gdb) po [UITableView class]
  (gdb) po @"Hello"
  (gdb) p indexPath.row
  (gdb) print indexPath.row
  (gdb) po fjkldsjflksdjklwjfkljfkldsjflk
  (gdb)
  </code></pre>
  
  <p>When I enter any of these commands, the command line just goes to the next line, where it prints the blue <code>(gdb)</code>, but no output.</p>
  
  <p>I tried the following steps:</p>
  
  <ul>
  <li>Restart Xcode, restart my Macbook</li>
  <li>Tried while debugging in the simulator as well as on a iOS device</li>
  <li>Switched to LLDB and restarted</li>
  <li>Re-installed Xcode</li>
  </ul>
  
  <p>The other debugging tools in Xcode seem to work okay: Breakpoints, step-by-step execution, the <strong>Auto</strong> variable examination window etc.</p>
  
  <p><strong>Any ideas?</strong></p>
  
  <p><strong>EDIT:</strong> Doesn't work even after a re-install of Xcode.</p>