for me I tried a restore on a fresh installation of Cross on my Macbook Air (in order to sync the collection from my iMac). Both running on 3.3.10. I tried including with all media files.
As described this did not work.
I now tried a backup withou media files, this also did not work.
I then extracted the content of the ZIP and copied the content manually (Analysis Files to the Analysis folder in the library, and Collection file to the Mixvibes folder). Opening the new collection worked.
However using the standard way would be much more elegant!
