The install process was going perfectly right up until the point where I go to the cp and click on the "click here" link to set up an administrator account, i got this error

d:/perl/htdocs/ubb/cache-8DL4SPX3/ubb_files/counter/2001-12.cgi: Expected to write out 1 bytes, but file on disk is only 0!]
Here is the backtrace:
Backtrace: ubb_lib_filehandle.cgi:190 -> sub UBB::FileHandle::tracer
Backtrace: ubb_lib_filehandler.cgi:128 -> sub UBB::FileHandle::close
Backtrace: ubb_lib_files.cgi:522 -> sub UBB::FileHandler::close
Backtrace: ubb_lib.cgi:662 -> sub main::WriteFileAsString
Backtrace: ULTIMA~1.CGI:145 -> sub main::hit_me

anybody know what would have caused that ?

Sounds like a permissions problem... upload your ubb6_test.cgi and check the permissions on your different directories...