Thanks for all of the advice Charles and Gizmo.
Ya know, the last thing I wanted to happen was the impossible. Why does the impossible always happen to me? (cue violins) Unfortunately, the shopping cart vendor has stated that it simply won't work with suexec (or any cgi wrap program). And it took over a week to get the shopping cart working, and I don't want to mess with it now that it's working. (Solving UBB problems is always easier and quicker than solving shopping cart problems.)
Would re-installing UBB fix the problem? Would doing something else fix it?