OK - I take it back. BoneJ 1.4.1 works fine in a just-updated Fiji. Not sure what it was I saw that broke it (or made me think it would soon be broken). Until BoneJ2 is out, it would be great to leave the 3D Viewer's API intact (at least from our selfish perspective). As for automated testing @ctrueden , that would be a great topic of discussion for you and @rimadoma later this month. We'll look to add testing for BoneJ2, synchronised as far as possible with the rest of the ecosystem, but leave BoneJ1 in old-school-manual-testing land to encourage user migration & to focus our resources on BoneJ2 development. I kind of expect BoneJ1 to get gradually broken by developments to ImageJ2 - at some point it will be unusable in contemporary ImageJ.