[otrs] two problems with LDAP authentication

I updated otrs from 2.0.4 to 2.2.3 yesterday on my debian server. I didn't change the db. I am still using the previous installation mySQL db. Today, if I use internal DB authentication I can get inside my OTRS as admin and all is fine. But, if I change my kernel/config.pm to use LDAP authentication, I get the following two problems. 1st. I no longer can get in as DB admin, I MUST use a different admin account from MS AD. 2nd. I no longer can get/see the edit field to enter user names on the left side of the [ User Management ] area of the admin > [ User ] section Can someone help me, please? Thank you in advance. Daniele