I've tried to fix this by upgrading now to v3.26 and still same problem.
Happens with any Comment template chosen, and has only started happening in the last few days. If I disable JoomlaComment plugin the site is fine again.
It seems to be dropping the top off the HTML, this is the very top of one of the broken pages:
<table class="blog" cellpadding="0" cellspacing="0">
<tr>
<td valign="top">
<table width="100%" cellpadding="0" cellspacing="0">
<tr>
<td valign="top" width="100%" class="article_column">
<table class="contentpaneopen">And it ends (note compelte absence of <html> and <body> etc:
<!-- END of joscomment --></td>
</tr>
</table>
<span class="article_separator"> </span>Any ideas?
