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So for example a TinyMCE field should only be visible if field2!="", once that field2 is filled in the TinyMCE field is hidden, when field2 is empty again and the TinyMCE field reappears the toolbar has gone for a walk into the top left.
This could be related to the new admin theme, and/or the sticky toolbar, I haven't had time to test as I am head deep in the project right now.