interesting... i'd like to have you try uploading fresh scripts and templates... could you do that for me?
you'll want to upload the following:
into your cgi-bin, delete & re-upload:
ubb_ files
cp2_ files
ultimatebb.cgi
cp.cgi
DON'T upload the vars_ files
into your ubb directory, delete the entire Templates directory and then re-upload it from the zip file...
let me know how that goes.