"and does this issue happen with a certain file alone, or is it universal regardless of every file you're creating inside of artrage/copying and pasting or importing an image from an external app? (I see painter blender marks in the background, so, I imagine, this is an imported .psd file?)"

It happens on all of the above. New files. Imported files. Old files. Art Rage 6 files. Vitae files. Jpegs. PNGs. Etc.

I agree with your assessment, it is likely a Mac Chip issue (I managed to get this working without issue on an ancient Intel iMac).

So far the escalated Wacom response has been underwhelming (switch to 60hz instead of 120hz) which, of course, had no effect.

Some strange interaction is going on.