Hi
New to the forum just joined when I saw this post, having the same issue with Smartviewer software v 4.9.2 on 2 PC's one on windows 7 and the other on windows 10 which have previously worked fine.
I have tried uninstalling and even tried rolling back software v 4.8.1
on a 3rd PC its working fine and I know the DVR is all good its just a graphics issue I am guessing down to a windows update?
If anyone has the answer let me know
Many thank for reading