Thanks for the quick reply!
I forgot to mention that I’d already tried to reset the permalinks! But, per your advice, I tried it again, and this time noticed an error message below the bottom of the browser window. Unless you scroll down you don’t see it. So… then I changed the permissions on the WordPress directory, so that it could write the .htaccess file, and it started working.
So, I was right about missing a simple configuration setting, and embarrassed that I didn’t notice it before. Just a permissions problem.
Anyway, normally I’m working on a server where the process running also owns the files. I thought I’d explore bbPress on my laptop, so they don’t match.
