It's getting late here, but...

I tried reinstalling the update_845 with no success.

I tried doing the main install over again ... Hmm Program error RestorePlugin... something; it's gone. It thinks it finished the install; no success. I'm just repeating that to get a snapshot of the error. Actually it does that error twice.

Presuming it again doesn't work, I'll try tomorrow putting a whole new empty bb folder onto drive_c (easy as it's a separate partition) and try a new install onto that. I'll see where I am after that.

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Jazz relative beginner, starting at a much older age than was helpful.
Kawai MP6, Korg M50, Ui24R, Saffire Pro 40.
AVL:MXE Linux; Windows 11; Win8.1: Scarletts
BIAB2022 UltraPAK, Reaper, a bunch of stuff.