I have had this issue as well and am patiently waiting for a new version to come out or a fix as I have also been using VLC player in the mean time hopefully they get this resolved real quick. I also came from using Powerdvd 22 but as you said they dropped UHD playback so was using Playerfab but to many issues with this player was hoping for a new player from DVDFAB am using VLC for now
Laprince
Thanks Laprince for the reply. DVDFab has issued me a refund which I'm currently waiting on. It's to bad PlayerFab doesn't work. I was sure I wasn't the only one who had a problem with it. Hopefully DVDFab comes up with a working version as the options for playing UHD ISO's on a computer are becoming pretty limited.