UBB.threads PHP Forum Software Community Forums UBB.threads 6 Version 6 Support Posts by user on one specific forum not showing up

Hi. When I go to one particular forum and select a user (say, "adam74") and do a search on all posts by user, no posts show up. If the poster (say "Tilt") has posts on other forums those show up but the ones on "PLOmaha" don't. This is a 6.4.2 installation (waiting for 6.5.2).

Any thoughts?

Chuck