The ACL features of Dokuwiki seem to be broken in my setup since I upgraded from Apache 2.0 to 2.2 in Debian. I'm not absolutely sure that this is what caused it (I am the only one using the wiki and I noticed it almost a week after upgrading) but nothing else has been changed, as far as I can tell, since last time it was working.
I can login from the login-page just fine, and that sends me back to the page were I clicked "Login" which now has all the "ordinary" logged in buttons such as "Edit this page" and "Update Profile". The problem is that as soon as I go to another page, or try to edit the current page, I go back to being logged out. That is, it seems to "forget" about me being logged in as soon as I do anything.
I've looked around for solutions to the problem, but haven't found anything in mailing lists or forums. I have tried to rule out PHP (which was upgraded from 5.1.6-1 to 5.1.6-5 when upgrading apache), ie. by turning on short_open_tag, but that does not seem to be causing it. I have also tried reinstalling Dokuwiki from scratch, to no avail.
Is this a problem with Dokuwiki, or with my setup?