Quite old ezp version, so this may be completely wrong, but... While playing with the latest jQuery 1.4.4, I experienced something similar since 1.4.4 broke the treemenu's DOM traversing.
Thanks for your help. Your hint kicked off some further investigation which lead to the solution in the thread: http://share.ez.no/forums/developer/content-structure-menu-doesn-t-work/%28language%29/eng-GB
Thank!
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