1001 bug: No Add Instrument slot and missing SI tracks in Logic Pro

Random issue - create software inst =

...no Add Instrument slot

..and, on (some) SI tracks that previously worked:

and in Environment

even with only 10-30 REAL SI tracks

I have been fighting this bug for a couple weeks - previously

never seen it before. But user on other forum said they had seen it

before.

[Edited by Moderator]

Original Title: 1001 bug