Hi all,
The most likely cause I can think of for this is conflicting cookies. Check your browser for two cookies called OJSSID (or whatever is configured in your config.inc.php in the session_cookie_name setting). If there are two at the current domain, and they are competing for your browser, it might be the cause. The usual cause for this is that OJS didn’t reliably/consistently detect your cookie path; you can work around this by setting an explicit value in session_cookie_path in config.inc.php.
Regards,
Alec Smecher
Public Knowledge Project Team