Affinity photo crashes all the time when:

[RuudvanU]

To make a line drawing from a photo I do this: Open the photo, duplicate the layer and with HSL I set the saturation level to 0 so I have a B/W photo. Then I get back to the copied photo layer and set it on color dodge. Next step to invert the layer with ctrl-i. (The screen is white then).The last step is Gaussion blur filter to get the line drawing and ajust it. There it goes wrong. I can export the line drawing but after that Affinity doesn't react anymore. Tried it several times with different photo's. 
I have a windows 11 laptop with enough memory for the whole town I live in ;-). 
 

[RichardMH]

First thing to try is turn off hardware acceleration. Edit->Preferences->Performance

[RuudvanU]

Thanks a lot. Everything works fine now! 🙂