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When using CKEditor and the new administration Toolbar in Drupal 7, the Toolbar overlays the CKEditor toolbar - preventing any button clicks when the editor is maximized.
Digging into the code with firebug, I guess this is related to some complex z-index issue. I just can't seem to get ckeditor maximize to overlay the administration Toolbar.
This is true for Firefox as well as IE. I also guess, that this issue might be unsolvable in the CKEditor module.