UPDATE: fixed. I had updated by installing only the update. I ran the full installer to re-install Dorico 3 and it fixed it.
I just updated to 3.1.10 (and restarted).
Upon reopening Dorico, I got a missing font warning for Sans Source Pro, which I’ve never seen before. Also, as you can see in the picture, the signpost is pixelated (and a different font), and the note input caret is odd.
I tried restarting again, just for grins. No change. Dorico is functional, but the caret is quite annoying, sometimes blocking the notes. Any suggestions?