Installed latest version to find the entire interface is blurry. Looking through the options I found a new interface scaling option, set to automatic. Thought it was weird as that should use my system DPI settings then which is set to 100% for a 1920x1080 screen. Tried unchecking the automatic option and setting to 100%. Nope still blurry. Tried going into the preferences file and found anti aliasing is set to true by default, disabled that. Nope still blurry, but better.
Downloaded and installed 1.6.7, the last version before the interface scaling, and everything is back to normal.