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I have the EXACT same problem. Role permission tree and dashboard chart are no longer working.
I think I have uninstalled the german language pack a while ago. I just reinstalled the “Interface_Adminhtml_Default” Package with MagentoConnect - no luck.
@andreladocruz: are you sure, the problem occured directly after uninstalling the extension?
They say absolutely NOTHING about it: the bug was closed without comment.
If there is ONE thing NOT to do in a bugtracker, it’s closing incidents without at least a comment.
Come on Varien, we are Silver Partner and pay good bucks. But for what?