Some issues I've noticed...

Here on this site while I was reading a news item I logged in using the box on the left. The page reloaded and the login box was still there, no error messages, nothing. Clicked on Forums and I obviously was logged in and the message in the left block appeared: 'Thank you for logging in, cebepuh.'

Had a similar experience on my site. I log in but the greeting was for another user. The next page I visisted from my site showed the greeting with my username correctly.

Both on this site and on my site, the redirect_header hack is used. Could this be causing the problem?

A user has complained that upon visiting his Inbox, the messages in it were to another user. In fact this was not his Inbox at all.

One more question: as far as I understand the cache generated by this hack is personalized. Should the default Xoops cache mechanism be used too while running this one?

Tested on Xoops 2.2.3