Thanks for the reply. After downloading and installing all updates, still facing the same issue. I see that the manual shows DP 1.4, but my monitor only shows 1.2 or 1.1 as options? Maybe that is the issue?
I'm using a Samsung UR59C monitor with a Dell dock and Dell XPS 13. Products are linked below (I've confirmed they all support 4k @ 60hz). When using a USB-C to DisplayPort cable directly between the laptop and monitor (my laptop only supports USB-c) I get 4k @ 60hz with no issues. However...