Seems I can't add to a previous post...

I've installed the accelerator on a forum on 3 different servers and each time I pass thetests then get a blank white page when ever I click on a forum from the front page:

Windows Server (i.e. no chmoded required)
UBB 6.2.1.1 with a few hacks
http://www.theringlord.com/cgi-bin/forum/ultimatebb.cgi

Unix server
UBB 6.3.1.1
http://www.gardentransplants.com/cgi-bin/forum/ultimatebb.cgi

And finally the live one (that works)- no accelerator though
http://www.chainmailstore.com/cgi-bin/forum/ultimatebb.cgi