Conrad Herman

Stypox, could you explain how you used the fill command so that the observers were put back in the correct orientations?

Im actually think this is a forge bug at the moment. Somehow when forge saves your world it saves the observers in the on state instead of their regular dormant state for the regular client. The forge client can read it correctly but something like the normal loder or optifine do not for whatever reason.

Hopefully either Forge or Mojang will find the solution to the problem soon.

Any ideas on how to fix it? The only way I can see would be to manually replace every observer, but that's bound to go wrong...

Having the same issue. My tree farm and TnT chamber are both broken to the point where it would need a full rebuild to repair.

The only way to depower the observers is to break and replace them or update them (which breaks many systems).