I switched from apache to nginx. Good.
I have the forum in the root and a /wiki. If I want to go to a wiki page with a üö or ä the ü get to a Ã¼ and so far so that I can't join the page. If I delete the cookies it works. But with apache it worked every time.
Why XenForo Cookies do that...
By default, when there's a reply to a conversation or a post, the mail is received, if the option is set. If the post or conversation has a attachment, it also shows "View attachment XXX". But it doesn't shows. The links are broken.
* XXX refers to the attachment number in the forum.