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Wordpress Admin panel is not saving categories when creating new post or editing it. Also same problem with adding categories or pages to menu. It just doesn't save changes when I press update.

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are there any javascript errors of some sort when you check them on firebug? – reikyoushin Jul 31 '13 at 13:35
please do a check also for XML errors , sometimes white spaces after the PHP closing tag( at the end of files), may cause this issue – iEmanuele Jul 31 '13 at 14:40
There are some XML errors... But I can not find whitespaces :( – levat Aug 1 '13 at 23:55

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