their is another option to this, instead of having Ultimatebb.cgi, you could have it as index.cgi (some servers it works on, others it dosn't, which is why the above is sometimes better). And replace all the Ultimatebb.cgi in the files with nothing.
so instead of loading this:
http://yoursite/forums/ultimatebb.cgi?ubb=forum;f=30
it would be:
http://yoursite/forums/?ubb=forum;f=30
The problem with this, on some servers index.cgi is not picked up as the index file, on others it does, my site has been on 2 servers in the last month, and one server it worked, and the other it didn't.