Downloaded 32 bit version of M10 on both Windows 2012R2 and Windows10.
On Windows 10 I also already had M9.
I created two connections on both environments, one to an AD and one to an eDirectory and while doing that I confirmed that the connection was valid and the user was correct and the password verification was successful.
From Windows 2012r" the connections were set up correctly and everything works as expected.
On Windows 10 the connection stalls at 14% every time, this is verified on another site too.
On Windows 10 the same connection works if I use M9 instead.
Since that is on the same computer it has exactly the same values etc.