i have a mid 2014 15” MBP and the thunderbolt 2 dock. I just purchased a Dell U3415W (3440x1440) to replace my existing Dell P2414H (1920x1080). I decided to try to use both displays through the dock and read in the manual for the dock that 2 displays can only be used if both use the native connection. What does that mean, to be native? I took it to mean no adapters, so I connected the U3415W via HDMI and the P2414H via DP-mDP but it still didn’t work. Only 1 display worked at a time. I’ve done some reading here and it seems you just can’t do dual displays with 1 dock, although it would be nice to understand why the manual says it’s possible. Does anyone know the answer to this? In my quest not to have to connect another cable to my laptop, I tried daisy chaining the 2 displays since the U3415W has DP out. I had the U3415W connected to the dock via mDP-DP and the P2414H to the U3415W via DP-DP. The P2414H would not sense the connection, not even when I removed the dock from the chain and connected the U3415W directly to the mbp. Any idea why this wouldn’t work? I did enable DP 1.2 in the menu settings of the U3415W.