Right, my apologies.
The brush packs used were:
https: //krita-artists. org/t/glitches-and-distortion-brush-bundle/81682
https: //krita-artists. org/t/glitter-gel-pens/92057
https: //krita-artists. org/t/lur-noises-thats-me-brush-pack/79814
Mameo Pen (by Mameo) recreated for Krita (1/2 unbroken links as I’m new to the forum)
I also tried the following single brush preset to test whether it was a problem with brush presets or bundles, and it also didn’t work:
Cheap Ballpoint pen Brush (2/2 unbroken links)
I’ve broken up some of the links with spaces as I can’t add too many links to a post. They’ll work if the spaces are removed.
And in response to @Michelist : yes, I have restarted Krita several times.
Thank you for your responses.