"the only reason i can see for the problem behaviour is a user has all tick boxes ticked. so possibility a settings aspect.
in all my testing so far ive ensured that all the stems boxes are ticked
and mix is unticked."

I tried this and still have the same problem. But one thing I am sure of is that the problem is intermittent.

Sometimes only some of the drums are visible, and other times nearly all the drums are visible apart from say the Toms are missing.

I wonder if this problem is due to not installing Biab in the default location. Ney, this doesn't make sense because Biab 2022 works fine.
...
If you're using a tablet instead of a PC or Mac, magnifying should be easy, just like a smartphone.

Band in a box 2024, Build 1114, Windows 10, 32 GB RAM, Intel Core i5-940F 2.9 GHz