I don't know if the green screen Hik-connect issue has been resolved because I don't use Hik-connect much because I have bitrates set high and it doesn't work well regardless. Although there isn't yet a new NVR firmware release, there have been a couple of updates to the Hik-connect app since January that may have fixed it?
I had downgraded from V4.60.005 to V.51.025 to correct another issue... NVR playback with the new firmware stuttered... I noticed @r44flyer had mentioned iVMS-4200 playback was still good with the new firmware version so I have loaded it again and he is correct.