I agree, we need more info. The questions above are all good.

Let's start with the fact that it should work. Assuming you have the same RealTracks, RealDrums and MIDI including styles on both machines, you should be able to create a file on one machine, save it, and open it successfully on the other.

So, is the BIAB installation the same on both machines?
What are the audio and MIDI settings on each machine?
Any plugins used on the laptop with this BIAB song?


BIAB 2024 Win Audiophile. Software: Studio One 6.5 Pro, Swam horns, Acoustica-7, Notion 6; Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus Studio 192, Presonus Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors