System information:
Operating system: Windows 10 (Anniversary Update)
Dual monitor setup
One monitor is a 4K screen (3840 x 2160) set to 250% scaling
The other monitor is (1920 x 1080) set to 100% scaling
Affinity Photo Version: 1.5.1.54
Steps to reproduce:
Simply open Affinity Photo in the 100% scaled monitor.
Select a tool (other than Move Tool), and move cursor over your image, it will be very large and pixelate (see screenshot with View Tool, large hand icon)
Other Notes:
If you move Affinity back to the high DPI display, tool cursor is perfect there.
Move Tool, which seems to just use default cursor does not have this issue.
Otherwise, I am super impressed how well Affinity works already on High DPI displays and multi monitors, it's not yet perfect, but far far better than a large number of Windows programs and competing photo editing apps. Well done!!