Hey guys, firstly here's my setup:
Windows 10 Pro 1903
Affinity Photo 1.7.1.404 (and also tested with the latest beta 1.7.2.434)
I've attached the file I'm using which is a score by Chopin which is freely available via a website known as IMSLP.
Open the PDF Chopin - Waltzes Op.69.pdf with Affinity Photo
In PDF Options, leave everything in its default state and hit OK
You should now see 8 pages
Zoom into page 1
Hit M to select the Rectangle Marquee Tool and draw a box around part of the score
Hit Q to switch on Quick Mask
Hit V to switch to the Move Tool
Now adjust the the handles which appear around the select to change its size (adjust several of them a few times)
You'll need to perform step 8 for about 10 - 30 seconds before Affinity Photo completely disappears without warning.
There is no error found in the Event Viewer on my system at all either.
I've uploaded a demonstration of this at https://1drv.ms/u/s!AobnWXPnBeTBgd5gEQXnYgvSec7fXA?e=kKkgXC
Any help is greatly appreciated, this is causing me some huge headaches
Fotis
Chopin - Waltzes Op.69.pdf