so, after installing and getting it to work on my studio's iMac, I then did the same for my PC laptop, and again very happy to report it's working with Rekordbox 3 - though again 'to an extent'
Again, it seems to work better and keep the hotcue/memory cue points when bringing in new tracks rather than one's already analysed by Rekordbox. I've not had time to work with it in great detail, but yes, to an extent this is working and so it's a big relief
I'm going to try deleting my whole rekordbox collections next, and re-import via Mixbibes next and see if this improves the syncing/hotcues for older tracks.
Likely know more by weekend - but yeh, this is great its still working