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at first it seemed that it was all ok, because I stayed log in...
when tested in another browser it wouldn't log in. but I also tested some other stuff so I figured there is another problem.
but tommorow I couldn't log with any user in any browser...
it simply says the standard "thank you for loging in..." message, but you are not logged in. it is not a cashe problem for sure.
so I tried returning the files to the 2.0.18 version.
when I returned the file "XOOPS_ROOT/kernel/session.php" to it's previous version it started working again.
so I guess the problem is in this file. thou the only differance is line 78.
it states "var $enableRegenerateId = false;" in 2.0.18.1, and it said "true" in 2.0.18.
Not sure how this affectes the problem, but it has to be it.
it is only used for a check in one place, and I am not sure what it does.