Some progress. According to my geek, it seems the installation process reset a variable showing all posts as unpublished. He reinstalled WordPress and did some tweaking of the modifications bbPress did to the database, so now at least we have the archive back and all the old posts are visible. The front page seems to be working as well.
I did an integrated install of bbPress today (WordPress ver 2.8.2) and it immediately messed up my main site. It deleted me as a user and I had to log back in as Admin to fix that problem. My front page went crazy and is still not fixed, and most of the time my site doesn’t appear at all when I type in the url.
I’ve removed the folder containing the bbPress files, but that hasn’t solved the problem. There are no bb_ files to remove from the database. Is there anything else that needs to be changed back?