OK, I think I found it.
1: Make sure BIAB is not running.
2: open your Preferences folder (eg C:\bb\Preferences)
3: create a blank text file called NoSplashScreen.txt
You can right-click in the folder and select New > Text Document, then name it NoSplashScreen.txt
4: Start BIAB

Let us know how you go.

BIAB & RB2025 Win.(Audiophile), Sonar Platinum, Cakewalk by Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Kontakt, Focusrite 18i20, KetronSD2, NS40M Monitors, Pioneer Active Monitors, AKG K271 Studio H'phones