Tuning drop

Any idea why Dorico is suddenly playing back at not-quite-a-major-second lower than it should?
(Have checked that Tuning is set to A=440.)

Happens with a current project using Note Performer.
Happens with a project from last week that was okay then, using Kontakt.
Happens with another year-old project using Note Performer.

But all of them export to audio at correct pitch.

No problem with Finale files.

Thanks in advance.

Please go to Edit > Device Setup and set the sample rate of the audio device to a different value, wait 3 seconds and change back to the previous value. Then close the dialog and the playback shall be in tune again.

Brilliant! Thanks, Ulf.