{bug}N7 does not open prjcs N8 well

Im on the N8, checking things with a new project.
After working, almost finishing, I went back to open it with N7 cause N8 could not open the omnisphere patch for some reason.
The project was opend easily, however, only few tracks could play audio - all others didnt.
I unmuted all the project and the N7 could play only few SFX tracks.