1: Start Arma 3 (Modded but that shouldn't be the problem - see "Additional Information")
2: Enter Eden Editor
3: Create Eden Composition.
4: Launch dedicated server
5: Enter server and assume Zeus
6: see "custom" in Groups -> Compositions Tab (F2) but be unable to place the objects (nothing happens except for a short flick in the Edit list)(These seem to be Zeus Compositions, the Eden composition tabs are missing entirely in this case).