3.1.1 for mac Composition mode doesn't work at all

When I am writing and try to enter composition mode, either by the button on the menu bar or by the view menu, it flashes to the composition screen for 1/2 a second, then goes back to the normal, non-composition mode.
This started when I upgraded to 3.1.1.
I have a MacBook Pro running 10.13.6
Thank you

I haven’t seen a problem like that before. I would first try reinstalling the software to make sure it isn’t an installation issue. If that doesn’t help, then reset your preferences, and then if that doesn’t work, leave Console open and monitor any messages from Scrivener when attempting to enter Composition Mode.

Console can be found in Finder, by using the Go ▸ Utilities menu command.

I did as you suggested and the resetting of preferences fixed it! Thank you very much.

Great, glad it was a simple fix!