I have the problem that unregistered users have no access to the forum. All user groups have Yes in the groups right stand for read, see etc. All user groups have Yes in the groups right stand for read, see etc..
Is there another shot I missed? or can it be a problem with the update of Xf1?
I think this relates to an XF2 test site, which does prompt me to log in.
It's possible it could be a cache that hasn't been updated in some capacity but the best way to test that is to change one of those permissions, perhaps the "View" one, set it to Never, then Save. Then go back and set it to "Yes" again.
Although we're not currently supporting XF2 with ticket support, if you submit a ticket then exceptionally we'll take a look. Please provide an Admin CP login in the first instance, though if we cannot troubleshoot it that way we may need database and FTP access.