Quick actions stopped working + Main Menu white screen

I’ve had an issue with the Main Menu for about a week or so, the one in the top left in the mac app or in a browser.
When I click it with a file open, the screen goes blank; the tab shows the file name, but when I click back to it, it doesn’t load. I have to go back to the main dashboard and reopen the file. Today the Quick actions keyboard command (command+/) is also producing an error ‘Unable to open quick actions’ – and I can’t open this anywhere else either.

I have checked this in a browser and am getting the same issues.

I cleared the preferences out, which didn’t work, but I wondered if anyone has an answer.