Hey there, I pretty much did a splitscreen, and that was about all. built lighting didn’t solve anything, remove vignette from the post processing, and look at the default text on the ground.
(sorry for the late reply…)
I just ran the test again and again I was unable to reproduce this issue. What are the post process settings on your Cameras? Are they different than the Post Process volumes?
I was able to see the text differing in viewports 2-4. I have entered a bug for this issue. The bug number is UE-25829. I do not have an ETA for when this issue will be viewed or resolved.