My clarinettist colleague and I share the work of preparing arrangements for our joint repertoire, and have just set up Shared Folders on Dropbox to make this easier. This way our two laptops should be kept in synch, and can provide mutual backup.

We freeze the RealTracks once we're happy with the arrangement, and each of us drops his completed files into his shared Dropbox folder, for automatic transfer to the other.

Although songs with frozen RealTracks are played correctly on the source computer, when they reach the destination the usual automatic generation of the RealTracks does not happen. On the other hand RealDrums are generated correctly, and any MIDI parts are played.

I've noticed a similar pattern on my iPad when I've transferred a song with frozen RealTracks - I need to re-generate the song from the iPad to get the RealTracks to sound.

The obvious work-around is to force the re-generation of the frozen source files on the destination computer every time they're played, but this takes time, and is likely to be forgotten in the heat of the moment when the backup computer is brought into action at a gig. Apart from this, the frozen track may well be the result of several attempts to get it to sound right, and re-generation takes it back to square one.

I can't believe that this is the way it's meant to work - could I have missed an option in Preferences? As the same problem occurs on the iPad, it can't be a matter of RealTracks being stored in different folders, as the iPad doesn't store RealTracks - what's exported is an audio file.