IE8 SmartScreen appears to break vbulletin forum

[hugh_]

I have a problem where IE8 (chrome and firefox appear unaffected but firefox ie tab is) recently stopped loading pages below the navbar on my website (error below). This appears to only be affecting the vbulletin powered pages of the site. Disabling Smart Screen doesn't solve the problem (before it was turned on I personally had no problem). Turning off Active Scripting is something of a workaround but the pages are no longer dynamic of course. No software threats have been reported against the site and I would expect any.

Any thoughts?

Thanks!

Hugh

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Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.04506.648; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)
Timestamp: Sat, 24 Oct 2009 20:27:54 UTC


Message: HTML Parsing Error: Unable to modify the parent container element before the child element is closed (KB927917)
Line: 0
Char: 0
Code: 0
URI: xxx
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[Jose Amaral Rego]

Report this in 'Bugs'

[hugh_]

A plug-in had stopped working, it wasn't an issue with vBulletin...