Hot on the heels of the phpBB 3.1 release comes phpBB 3.1.1. It’s just a fix for a minor security flaw and a few small functional things, but you should apply it straight away.
This sort of thing is quite common for big feature releases. I expect there will be a version 3.1.2 coming soon too. 🙂 Having said that, the release cycle of phpBB is quite reserved compared to most open source projects, so once it’s stable, you can forget about it for a while!
Cheers
Tim…