Some passwords may not have converted during the forum update because of a new and more secure UTF8-based password management system. If you get a message telling you this just click on the "send new password" link and follow the instructions displayed. Alternatively you can use the "forgot password" option to send yourself a new password.
Note that there is now only one forum style. More may be added later, but only if they don't interfere with updating the forum software for security fixes etc. The multiple styles on the old forum made updates a nightmare, because the source code almost always needed to be edited manually for all the individual styles.
The feeds have also changed: The feeds are Atom only (phpBB3 does not support RSS out of the box). Currently you can subscribe to individual forum feeds with the feed icons in the individual forum list and a general feed with the feed icon in the main forum header. The feed icons are only displayed if you are logged in.
Please let me know if you run into any problems. I've tested this pretty extensively with a local installation before putting it online so everything should be OK.
