This is I *think* a holdover bug. In earlier versions we auto-converted & to & I don't believe we need this anymore. I'm commenting it out for 7.0.2 and we'll see if there are any side-effects that I'm not thinking of
Forgot to add. If you'd like to test this and report back on any problems you might find you can make this change by editing libs/ubbthreads.inc.php. About line 911, you see this: