I think the collaboration feature has been a useful addition to Orange CD, but there still seem to be a few bugs. In this case, the problem seems particularly puzzling. I did a query for all my albums that I actually have on a cd ("Format is exactly cd " under advanced search). SOME of the collaborations appeared but others did not, including some with a common artists. That is, a Chet Baker & Lee Konitz cd did appear, but a Chet Baker & Russ Freeman cd did not. I can't see any difference in how I entered the data, so am preplexed as to what is going on.