title: In windbg, what can cause the message "WARNING: Unable to verify timestamp for mydll.dll"?
body: <p>I have a dump (created by SysInternal's <code>procdump</code>) and when I ask to view the call stack of a thread I get the error:</p>
  
  <pre><code>"WARNING: Unable to verify timestamp for mydll.dll"
  </code></pre>
  
  <p>I own the source code for <code>mydll.dll</code> and I have the <code>PDB</code> file for it, the call stack seems valid but I would like to know what can be the cause of the message. In the past I did not get that warning message.</p>
  
  <p>Thank you.</p>