Blog layout broken when JoomlaComment turned on

I have a site at http://www.hiphop.com and all of a sudden the blog layouts are broken when JoomlaComment is turned on.

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>

I've left comments turned off for now as it's a live site!

Any ideas?

Resolved Blog layout broken when JoomlaComment turned on