Solved:

I downloaded ddwrapper.zip from this site: http://bitpatch.com/ddwrapper.html

and put files inside into the MM6 folder, and THEN I installed grayface patch, and it works.

I'll inform you if I find more problems.

Sorry for making you concern.

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Hello, I just purchased Might and Magic 6 from gog.com

And I installed Grayface patch for MM6, from here: https://grayface.github.io/mm/#GrayFace-MM6-Patch

However, it's not working.

More specifically, it's minimized and I couldn't un-minimized it.

https://youtu.be/VbUTvzKh80M

Please look at my youtube video, that's how it happens.

I played it WITHOUT graypatch and it worked fine, should I delete graypatch?

Thank you.