This is one I haven't heard before.

I assume from your post title that the songs reload, but without data in the MIDI tracks. Is that right? MIDI data in the Melody and Soloist tracks would be there, but on any other track, you would have to press Play to generate the new MIDI data (unless the tracks were frozen; were they?).

If that isn't the problem, could you please tell us what version of BIAB, what version of Windows, whether or not you have UAC off, and whether you use an external drive or installed to your own hard drive? Is this a new behavior, and if so, did anything change recently on your system?

Doing the Opt., Return to Factory Settings is always good. Did you also reboot?

BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.