- I allowed MM5 to import settings from MM4
- it imported this MM4 collection ... as this MM5 collection
- [probably irrelevant, but included for completeness] I cleared by MM5, and then rescanned my tracks
- ==> the collection is empty in MM5, but not empty in MM4
- I made an identical collection in MM5, see comparison ... the new version contains all expected tracks
I PM'd the database to Ludek for analysis.