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ok. I'm EXTREMELY frustrated at this point.
I have basically the same problem as the first guy: I can log in and browse the site, but members get the sorry message. (Unlike the first guy, though, annonymous users can see the site just fine, as long as they're not attempting to log in.)
I verifed that registered users had access to all modules. I emptied and repaired the xoops_session table. I made sure the main.php had the right URL. I turned off custom sessions.
...I honestly don't know where the sorry page is in order to add the no cache statements in the header, so I haven't tried that yet. But everything else failed.