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Thx a lot DonXoop. It's solved. The problem was, I had to edit the theme.html file of my theme (installing the newbb 2 forum required this), but everytime I edit this file and safe it with openoffice the website turns out code. If I edit this file with notepad everything works fine. The edited file in openoffice is also a lot bigger regularly.
Well, once I discoverd this everything worked out fine.
Anyway, thx a lot for the help!
Warm Regards,
Marc