I've disabled third party applications (I only have one : Links),
I disabled mod_security,
I'm using now a default theme,
I've set PHP memory_limit to 512M,
I deleted the forum they can't access after moving all the topics in a new forum, but these members don't have access to the new forum either...
These members say they see this error message : (I've enabled display_errors momentarily)
In the server error_log, I have the same error messages + the members' IP. By the way, do you know why there is a number after the member's IP (in bold, below) ?
Any other ideas are welcome...
Thank you. 🙂