OK, here's what I did, the whole story:
I uploaded the lates wp gold, plus import-textpattern and the b2-include folder. Then I couldn't log in anymore, the following error occured:
Since you’re a newcomer, you’ll have to wait for an admin to raise your level to 1, in order to be authorized to post.
You can also e-mail the admin to ask for a promotion.
When you’re promoted, just reload this page and you’ll be able to blog. :)
The database told me, that I still have level 10, so something is probably going wrong.
Then I re-installed the gold version of wp and things worked great, just noone could comment any more. Now I am uncertain what to do about it, if anybody has any ideas, they're greatly appreciated.