I see this behavior sporadically when working with large-ish individual html files (over 300kb). Sometimes it seems to be caused by running a very long session (? undo and clipboard buffers overlarge ?), and then simply closing and re-launching Sigil does the trick. But occasionally I MUST split the html files to get the two panes to synch.
Using version 0.9.9. on Windows 7 and Windows 10.
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