My experience after upgrading from Win 7 to 10:

Things went fine for a few days - I left everything pretty untouched just to get used to the changes.

Suddenly, I couldn't drag and drop between...

Tried unchecking the indicated option - no effect.
Tried all the different optimization selections - no effect.

I can't even get the translucent thing going (which would help a bit).

Just upgraded to Win 10 myself and ran into the same issue. Going on the assumption that a picture is better than any number of words, I've attached a screen grab of the issue.

In it, I'm...