Hi
What version of BiaB?
You are ensuring that you are looking at the Bass notation part, and not inadvertently at a different instrument?
Can you advise the Style you have selected for the song?
Is it a RealTrack or MIDI track?

Sorry for so many questions, but there are many variables. This will help to diagnose.
Trevor


BIAB & RB2026 Win.(Audiophile), Windows 10 Pro & Windows 11, Cakewalk Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Session Keys Grand S & Electric R, Kontakt, Focusrite 18i20, KetronSD2, NS40M, Pioneer Active Monitors.