thanks for contacting me.
Can you confirm that you are using bbpress 2.5.4?
and if you are, can you check that the profile information plugin is still active – I’ve heard that the upgrading process to 2.5.4 can leave some plugins deactivated. If not activated, then please reactivate and test again.
Once you have done those two checks, then we need to check if there is a plugin or theme conflict that I need to look at.
Plugins
Deactivate all but bbpress and profile information. check again whether profile information now woks. If it does, re-enable one at a time to see which is causing the error, and report back.
Themes
If plugins don’t pinpoint the problem, switch to a default theme such as twentytwelve, and see if this fixes. Again come back to me.