LDAP no longer works since an update. The filter configuration is damaged. The round brackets are missing in the LDAP contact filter. Incorrect: objectclass=contact, correct: (objectclass=contact).
Remedy: add the round brackets to the LDAP Contact Filter and save the LDAP configuration.
The screenshot:

Another option is, to edit /etc/gromox/ldap_adaptor.cfgand insert the brackets in the line with: ldap_contact_filter=(objectclass=contact) and save the file.