One person in that thread said he has to do it once a week. I have been upgrading xenForo once every week on that site since the Beta's started coming out. I wonder if the upgrade process destroys cookies or something when it is done?
I (and my members) are having the same problem here (the auto-log out). It seems to happen even when changing between forum nodes / threads. I have checked my User.php, as well as deleted all cookies related to my forum. I am seeing this in Chrome and Safari, and others are reporting it in Chrome and FireFox. Any ideas? Is there anything I can provide to help troubleshoot this?
Count me as another person with this problem on my website after upgrading yesterday to 1.2. It just happened to me. Logged in, clicked a thread, click a different link and I was logged out. There's no prompt, you just realize that the login bar is back at the top.
It seems to have stopped on my end. I really believe it had something to do with upgrading 1.2. Every single time I would upgrade during the Beta and RC phases I would get complaints about this. We will see what happens when 1.2.1 comes out.