If I log in in the CB system and then go to the phpbb forum, I'm not loged in there. Only if I log in as admin I'm loged in in both systems. As a normal user not.
Might be an "sid" issue with the logins... check to see if the phpbb_sessions table shows the user as logged in... if it does and the user is still showing as not logged in then that usely happens when cookies are not working correct and the sid is not in the url... Version 2 helps this by having the sid tagged onto the url as phpbb does.
The special characters issue I have seen before but don't yet know how to fix... if may be a character encoding issue with the html... don't know yet...