I had Dorico open yesterday, closed the lid of my MacBook Pro.
This morning I opened the computer and tried to add a comment (Alt-C).
I could not read the comment, as all letters seem to be either invisible or black, I don’t know. I saved the comment anyway.
Then I noticed, that the list of layouts also showed no visible content, after which I made a screenshot:
Then I tried to make another screenshot of inputting a comment. What happened: I typed a few letters into the black, then suddenly the following letters would re-appear (so no screenshot). In the mean time the list of layouts was visible again.
I am going to relaunch Dorico and I am sure the problem will be gone. Just thought, it would be good to mention it.