I’ll put this under BUGS, but you may wish to consider it a current feature :–)

Objects appear in the Object List Inspector multiple times. If objects in different scores have the same ID, they can appear simultaneously and appear to be duplicated. If your Current Project lists more than one score and you are not working on the first one that comes up when you load Iannix, you may have objects from multiple scores in the list. Furthermore, for every additional score that you choose to work with during a particular Iannix session, those scores’ objects will be added to the list and they will remain there. This can result in three, four, or more objects in the list with the same ID (if, for example, you’ve cloned several scores from a common prototype). If you’ve worked on more, those will be added to the list as well. This will also result in not seeing an object light up when you click it in the list because it is actually located in a score you’re not currently viewing.

I strongly feel objects only for the current active score should appear in the list (same for groups, of course). Simply browsing through your scores will add objects to the list for any of the other scores and they will stay there until closing the current session of IanniX.

Cheers,
–Bob