What seems to be different in yours is the lack of Stems that I've got. The stems are really the problem. Do they not import into RB correctly?

Some of the Stems import to the wrong measure, starting the recording a measure late. The other Stems are actually playing at a slower tempo, making the while thing a big mess, as you can imagine.

Now I got a suggestion from support to try Drag-And-Drop each track one at a time. I followed the video tutorial, which showed how to drag the track onto the DAW toolbar button to make the track into a WAV file. I saved the WAV files to the same folder as the .sgu file, and then dropped them into a new RB doc. Doing it that way worked perfectly, except I don't end up with chords in the Chord View, so can't edit the chord rhythms, shots, holds, etc.

Band-in-a-Box® for Windows
Version 2026 (1217)
64-bit operating system, x64-based processor
RealBand 2026 (4)
Windows 11 Home
Intel(R) Core(TM) 5 120U (1.40 GHz)
12.0 GB (11.7 GB usable)