This seems a bug on the website. If you load the page with FireFox it is very explicit about the following errors, they are not shown to the user by default:

Timestamp: 2/16/2014 13:51:21
Error: ReferenceError: YAHOO is not defined
Source File: http://www.onlineclarity.co.uk/friends/clientscript/vbulletin_global.js?v=367
Line: 11

Timestamp: 2/16/2014 13:51:21
Error: TypeError: vBulletin is undefined
Source File: http://www.onlineclarity.co.uk/friends/clientscript/vbulletin_menu.js?v=367
Line: 11

Timestamp: 2/16/2014 13:51:21
Error: TypeError: vBulletin is undefined
Source File: http://www.onlineclarity.co.uk/friends/clientscript/vbulletin_global.js?v=367
Line: 11

Timestamp: 2/16/2014 13:51:22
Error: The character encoding of the HTML document was not declared. The document will render with garbled text in some browser configurations if the document contains characters from outside the US-ASCII range. The character encoding of the page must be declared in the document or in the transfer protocol.
Source File: http://www.onlineclarity.co.uk/friends/hexresults.php?nr=27
Line: 0

I'm looking at adding a way to disable the javascript error reporting but this won't solve the problem that there is indeed a bug on the site end.