I noticed if I leave the editor pane "open" (whether right or down positioned) and do not close it when I go into wp admin area (anywhere) it also tries to open the pane and, at least in chrome, crashes the page. If I go back to the post/page and close the editor pane so it is hidden I can then return to the admin area normally.
p.s. I know I've posted a lot of stuff but this is a really great idea and I'd like to see it well polished. I may even help you out with a few of these...if time permits. Keep it up =)