Ya, too many problems....

Lets try just one.
Quote
I did an experiment with this new great BiB 2024 v.1109.
1. Made a short 8 bar chord sequence, just 8 bars, no repeats.
2. Style ZZJAZZ, tempo 140.
3. For bass I chose Hi-Q Upright Acoustic Bass 'N'.
No Midi patch.
4. When I came back to Mixer I noticed that BiB had changed the Track name 'Bass* to 'Piano 1'.
And Piano track was changed to 'Piano 2' (of course).

I did this and it worked just fine. No changes in names. So, why do you say "...no Midi patch"? I was able to assign the HI-Q.
Regarding the naming, there is a Preference for that (see pic). But that really should not effect what you claim here.
If this was you only problem I would say you need to do a Return to Factory Settings.

One down...
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BIAB – 2025, Reaper (current), i7-12700F Processor, 32GB DDR4-3200MHz RAM, 1TB WD Black NVMe SSD, 2TB WDC Blue SSD, 1TB WD Blue, 2 TB SK NVMe, 6 TB External, Motu Audio Express 6x6