Tempo data absent from Tempo lane

In Key Editor with a tempo selected (or picking the Tempo dropdown), I expect to see a visual graph of the tempo - but the graph is blank. Metronome marks and gradual tempos present in the score and heard on playback are simply not displayed as they should be. Dorico 6. This always worked before in Dorico 5 and before building a new template to host a new audio library.

Hi @indigo3301, I cannot confirm this. (Maybe check your tempo range settings?):

Can you upload a Dorico Project that presents the issue?

I did, first. No go. Thanks anyway.

It was a Dorico project attempting to use Vienna Symphonic Library patches, playback template, and expression maps. What a monstrous waste of time and effort. I’m bailing out on the use of VSL in Dorico.

Not sure how this can be related. Dorico shows the tempo informations (in the key editor) also with the Silence Playback Template and even with the project deactivate (blue button).
(And even after deleting all Players, leaving just the Flow)