It is strange that you have these issues with multiple documents open. It should not really matter as it works with the current active document. Multiple documents in Word are not that easy to handle and distinguish programmatically.
I also suspect that the add-in you use to easily handle the multiple documents is causing some interference here.
Anyway, as soon as I have worked the net HTML conversion engine in, which might also help the issue you have with the ePUB generation, the spelling part will be investigated again. I am still not happy with its performance, although there is probably not a lot I can do about it...
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