I use LS 2.05 with a double authentication (LDAP and internal). All is working correctly.
Now, I've updated to 2.06 build 150911 by downloading the latest stable release (files from LS.org).
All the process went flawlessly.
The problem : LDAP users can authenticate without problems, but internal users are denied access ! (except for the admin, who can authenticate)
Sounds worth a bug report. Please create a ticket at our bugtracker and provide as many details as possible.
Best regards/Beste Grüße,
Dr. Marcel Minke
survey-consulting.com
offlinesurveys.com
Feel free to contact me by email for professional LimeSurvey support!