RDP to Windows 10 blurry

Just to clarify, the setting is located within Intel HD Graphics Control Panel on your host machine.

Apparently Intel had updated my graphics drivers.

the link @duDE posted has the following text:

If you are using Intel HD Graphics, try opening the Graphics Control Panel
(right-click the desktop and select Graphics Options), then go to 3D and 
Turn Off "Conservative Morphological Anti-Aliasing. I was having a similar 
issue and this fixed it for me.

This setting was now enabled. Disabling it, then reconnecting fixes the issue.