andi I know it's a longer and complicated proces to find the bug, it was just a joke, that is why I put a smiley at the end of my reaction.
I have a backup so I try to deactivate all the unnecessary plugins and going to make a 2nd try. After that I'm gonna check my logs and try to activate plugins one by one. If jwc will by able to post his plugins will by fine to compare.
I love DokuWiki and thanks a lot to all who works on it!