I broke again this AM, here's the code from the 404 page. No sign of the caching happening. I'm going to reset the permalink and disable WordFence for 24 hours and see what happens.
<HTML>
<HEAD>
<TITLE>404 Not Found</TITLE>
</HEAD>
<BODY>
<table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="100%" id="AutoNumber1">
<tr><td><b><font size="6">Not Found</font></b></td>
<td>
<p align="right"><a href="http://www.servage.net/">
<img border="0" src="http://www.servage.net/img/content-logo.gif"></a></td>
</tr>
</table>
The requested URL was not found on this server.<P>
<HR>
<ADDRESS><a href="http://www.servage.net/">Servage.net</a> Clustered Webhosting running enhanced Apache Webserver</ADDRESS>
</BODY></HTML>[Moderator Note: Please post code & markup between backticks or use the code button. Your posted code may now have been permanently damaged by the forum's parser.]