I just bought a 4K monitor (Dell P2715Q). Ableton Live works othervice fine with "Zoom Display" 100%. The user interface looks a bit blurry, but I believe this is a know issue.
Now to the problem: When controlling sliders and knobs with the mouse, the movement is way too fast for proper control. It is almost impossible to adjust e.g. a channel volume slider. I can get around this issue by selecting a control first by mouse, and then adjust the value using arrow keys on the keyboard.
This workaround does not work e.g. for automation. When I click an automation dot, it just "flies around" immediately.
It looks like Ableton Live is calculating the mouse input wrong, due to the high resolution of the user interface?

Anyone else noticing this???
Thanks.
-Slartibart.