I don't believe that should make a difference. I just went to your forums and when I go to:

http://cyabc.infopop.cc/ubbthreads/ubbthreads.php

That works fine. No errors. But when I click on a link it takes me to something like:

http://www.cyabc.infopop.cc/ubbthreads/postlist.php

I think one thing you might need to do is edit your config file. The config.inc.php file. THere is one variable called $config['phpurl']. This is probably set to "http://www.cyabc.infopop.cc" It looks like it needs to be "http://cyabc.infopop.cc"

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Rick Baker
UBBThreads developer