Driver Issue? OS Problem? Both? NEITHER?!

[u/csfossett]

I just bought a new M6 Mac Mini with OS27 preinstalled. I've been trying to use it with an Apple Display, Intuos Pro (which I essentially use as a mouse) and a Cintiq Pro 24 plugged in directly via USB-C. This setup has been near-perfect with my M4 Macbook Air. On the Mini, though, despite several clean installations (and deinstallations) of the newest Wacom driver (6.4.15-1), the Intuos stops accepting tap-clicks after 5-10 minutes—and sometimes even quicker than that. The cursor follows the pen tip and hovers around, but I can't click on anything, or click and drag. Restarting the driver "fixes" it, but the same thing happens again almost immediately.

I've scoured every Wacom-related detail on the Mini to make sure all of the required permissions are in place (and fully deleted before reinstalling the driver), and I'm pretty sure I have everything set up correctly. I even tried connecting the Intuos on its own, but the clickability still breaks. The only differences I can see are the Macbook Air is still running OS26 with the previous generation of Wacom driver installed (6.4.13-4).

Any suggestions? If I can't resolve this, the Mini's going straight back to Apple. I only bought it because I have some big projects coming up and didn't want to risk thermal throttling on the fan-less Macbook Air. But under these circumstances the Mini is basically unusable.