I've noticed that as well, sometimes it's green sometimes it's orange using the same rotation. Not sure if it has anything to do with clipping or combo powers.I haven't had an issue with it disappearing (I haven't tried having it in both trays either), but I have had an issue with stacks not building on it or stacks sloughing off of it when I switch to it in the other tray. So, I'd say that this issue is different from the other reported issues of Omega disappearing.