Yes! exactly this! I have a Mac mini Sonoma 14.3.1. Vitae crashes all the time. Artrage 6 is stable but I do have those glitches you're talking about. The brush lag and then if I resize the window or move the canvas its normal for a few brush strokes them bam back to lagging again. It's making it slow to work with. The dark patches disappear when the canvas or window is resized. I also get the imprints of some of the tools at times. Highly disappointing! I upgraded to Vitae thinking it would fix it but nope Vitae crashes! Its worse!