title: WebBrowser.Navigate(...) throws COMException
body: <p>I'm developing an Internet Explorer command button that will open a specific web page once clicked. Here's a snippet of code (<code>IEApp</code> is a reference to an instance of <code>IE.WebBrowser</code>):</p>
  
  <pre><code>IEApp.Navigate(sURL, ref one, ref two, ref three, ref four);
  </code></pre>
  
  <p>The above line throws the following COMException:</p>
  
  <pre><code>Exception Source:      Interop.SHDocVw
  Exception Type:        System.Runtime.InteropServices.COMException
  Exception Message:     The requested resource is in use. (Exception from HRESULT: 0x800700AA)
  Exception Target Site: Navigate
  </code></pre>
  
  <p>This wasn't a problem on IE6 or IE7. Any ideas on what's going wrong? I'm using AddInExpress for creating the command button.</p>
  
  <p>Cheers!
  Christian</p>