I never had problems with WordPress but now I've lots. I've lost all my categories, which are still there but with no names. Just blank spaces with postings in it. I can't edit them either.
And I've lost all my precious Ü, Ä, Ö in my old postings. Can I somehow get them back?
I've had this error before but fixed it: http://wordpress.org/support/topic/172272?replies=18