Could you please post a screenshot taken at View > 100% and with the pertinent Panels (Layers, Channels, Options Bar, …) visible?
What are the image’s Color Mode and bit depth?
Hi, I found the solution!
My language is Dutch as you noticed on the print screen, so I try to explane it in Englisch.
1: Go to EDIT>Preferenies>Prestations
2: GPU prefeferenties> Use GPU
3: Advanced Preferenties> Mark: Use GPU for faster Calculations.
Thank you! This was my problem and solution.