Bumping this, if anybody might be interested I've tracked the problem down, all the way to the database. The bug somehow occures in my item_template table, I have done a lot of modification to this table.
After 3-4 hours redoing my entire item_template table I finally found the problem... So obvious! The bow in the above pictures entryid were set to 0, which screws the entire character creation up... So lesson learned: NEVER aciddently make an item entryid '0'...