Hmm... well if other accounts are working properly, and it is just yours that is not, try using an LDAP browser to see if you can spot anything odd about your account versus an account that is working. I use LDAP Admin myself, but anything will work. Bind to the server using the admin account
and the LDAP root password found using
If you can't find anything then you might try migrating your data over to a new account. You can export all data under Preferences -> Import / Export, and supposedly Import it as well, never tried this myself though so I don't know how it will handle things like different account names and the like.
zmlocalconfig -s ldap_root_password