Keiser m3i pair problem with new update?

Using a Keiser m3i, with bluetooth dongle (M series converter’), and after many months of seamless connection on startup, following the update today, Zwift will not pair with it.
Once it kind-of paired, but no power/cadence data came through. Since then (successive reloads, and reboots, of PC and dongle) it does not see the m3i at all.
The PC sees it on the bluetooth device list.
Anyone seen similar, or have ideas?