Error Saving File in Dorico 4

ERROR SAVING FILE WHEN PROJECT NOT ACTIVATED FOR PLAYBACK.
Hi Everyone. It’s Tuesday 21st Feb 2023 and i’ve just dug this out because i’m having the exact error message. Seems to be saving ok but it’s really interfering with my work flow. Just asking because this was flagged up January 2022. I’m sure it’s been fixed by now but I can’t find the fix. Help. Wayne.