I'm having quite a bit of trouble getting Might and Magic VI to work in windowed mode using F4. I'm using the Greyface patch and I have the DLL in the "Exemods" folder that was mentioned in these other threads. I can't find 'anything' about anyone having this particular problem however, but I'm sure someone has

You only get that bit of screen when my window is in the top left corner of my monitor. If I drag it into the center or down into the bottom right, I'm left with an after image and no screen at all. Anyone have any ideas?

Hm, do you use DPI scaling in Windows to make your fonts bigger? If so disable it completely or only for the game on the compatibility tab.
Right-click the game's shortcut, select Properties and go to the Compatibility tab. Tick the option for "Disable display scaling ...".

Also make sure DirectX9 is completely installed, by installing this:
http://www.microsoft.com/en-us/download/details.aspx?id=8109

That option is apparently already ticked and I've installed all the DirectX files correctly, I think. The problem is still here :(
Sorry for double post, but I've apparently solved the problem? I closed the game in windowed mode and then restarted it on accident and it's fixed. Uh, well. Alright. Sorry to bother you guys!

No worries, thanks for the feedback. At least it's working now ;-)