When I joined my multiplayer server today, I was greeted by most of my cables being disconnected from each other and from their respective machines. When I look at the server log, I see about 38 errors that look like this:
[01:45:20] [Server thread/INFO]: ThomJ joined the game
[01:45:20] [Server thread/WARN] [IC2.EnergyNet]: EnergyNet.addTileEntity: ic2.core.block.comp.Energy$EnergyNetDelegate@529ee209 is already added, aborting
[01:45:20] [Server thread/WARN]...
as well as...
[01:46:21] [Server thread/WARN] [IC2.EnergyNet]: EnergyNet.removeTileEntity: ic2.core.block.wiring.TileEntityCable@39aaf428 is already removed, aborting
[01:45:20] [Server thread/WARN]...
I looked up this issue a little bit and people were mentioning that a chunk loader fixes it. Not so in this case! I had a chunk loader (more specifically the IC2 chunk loader which was powered) and this still happened.