Cross-version parameters and preferences
Each new version generates incompatibilities between files.
I've lived a bad experience between V2 and V3 when I realized that my carefully tuned configuration was simply unuseable by MS3 :-(
This is the same with scores, prototypes, styles, etc.
Can you please try to implement conversion (forth and back) between versions?
I'm plus or minus obliged to work with Windows and Linux versions concurrently and this is a limiting factor: if I save a score with a recent version, I'm no more able to open it with a previous one, even a recent previous one.