Can't move adjustment brush across image
Hi, all! I'm having an intermittent issue that I can't seem to troubleshoot on my own. After having worked in Lightroom Classic for a while, I can no longer move the adjustment brush across the image and instead it just sticks to the borders of the image. The RGB values by the histogram shifts, so it looks like it really moves, but that this isn't reflected in the interface. A reboot of the computer fixes this for a while. I've tried switching of graphic acceleration, but to no avail. Has anyone experienced something similar? Can you think of a reason for this behavior? I'm on an 2019 Apple iMac on Mac OS 10.15.6 (latest) and have all updated all Adobe software.
I've put up a video here showing what I see: https://www.dropbox.com/s/780pqsz0thgbrp1/IMG_1489.mov?dl=0
