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If I enter some text into my TinyMCE editor and then press the fullscreen button, it opens up an empty fullscreen editor, deleting all of my content.
Interestingly, if I start in the fullscreen editor, enter some text and then return to the normal editor, my text is preserved. Of course, if I press the fullscreen editor button again, the text is lost for good.
I've tried this with WYSIWYG 6.x-2.3 and 6.x-2.x-dev, and with TinyMCE versions 220.127.116.11 and 3.4.2 (both for jquery).