AFTER EDITING HAVE WHITE LINES

[Peter Cadot]

Need some assistance please as I have had Affinity for a few years now and have enjoyed working on my photos, but I have just purchase a new programme and started editing.

However, I now have white/pale lines through my photo. Not sure what is happening and need some advise or what I should do next to stop this?

I have attached a photograph for reference.

Can anyone assist please I would be most grateful Thanks Peter 

[Komatös]

Hello and welcome to the forums, @Peter Cadot

Please go to Edit -> Preferences -> Performance and untick the hardware accelleration.