sessionhash is still there in vBulletin 2.2.7, but the new version fixes some of the problems relating to it. The big change that I'm aware of is:
Quote:
Forumdisplay.php, index.php member2.php, poll.php, search.php, showthread.php, threadrate.php, usercp.php, admin/functions.php; changed array cookie storage format to fix issues with staying logged in
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Try upgrading and see if that fixes the problems that your users are experiencing.