I just purchased an LG UltraWide monitor for my Mid 2014 Macbook Pro. It is connected via Mini Display Port to HDMI. Unfortunately, I found out that Sierra isn't compatible with the 2560 x 1080 resolution, so I had to use software (SwitchResX) to get it to work. However, using SwitchResX it can only work at around 50 Hz and some of the text looks not as sharp. I called Apple and the tech I talked to said in a month, an update would be released that would fix the issue. I went out and installed the beta of 10.12.6 and second beta of 10.13 and it still doesn't work. I've heard some people who connect via the new USB or Display Port don't have the issue. I'm frustrated because I like the monitor, but I feel like it's not being used at its full capacity when I have to use SwitchResX. Does anyone know any other solutions or if this might be fixed in later betas of High Sierra? I have 14 days to decide on returning this, so need to make up my mind soon.