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Well being as I just started to use XOOPS I am learning myself so I ain't no expert here, but I would not think it's the HTTP_REFER because that has nothing to do with being logged out...the thread stated that The HTTP_REFERER is a privacy setting - all it does is tell the webserver, which was the LAST page, you viewed - and only for that site. It is used to determine whether people are submitting a form on YOUR site, or somewhere else on the web
So I would say no to that. Clear you cache files on the server and on your computer and double check your server and see how they are running sessions. Do a phpinfo() You might find it's the way your server is configured and not XOOPS at all. That is what I would do if I were you.
// Show all information, defaults to INFO_ALL
phpinfo();
// Show just the module information.
// phpinfo(8) yields identical results.
phpinfo(INFO_MODULES);
?>