Set up a small test area with a Few Furnaces connected to an MFE, which lead to an Ind. Furnace. Everything seems to be working fine there, but when I replaced the Higher voltage cable (gold) with a lower one (Copper), it promptly melted with a "Pssssth", the game locked up, and went to a "Saving Chunks Screen".
This is the error that occured:
java.lang.NullPointerException
at sz.a(EntityPlayer.java:626)
at ic2.common.EnergyNet.onTick(EnergyNet.java:97)
at mod_IC2.OnTickInGame(mod_IC2.java:1242)
at ic2.platform.Ic2.OnTickInGame(Ic2.java:373)
at BaseMod.OnTickInGame(BaseMod.java:80)
at ModLoader.OnTick(ModLoader.java:1016)
at EntityRendererProxy.b(EntityRendererProxy.java:16)
at net.minecraft.client.Minecraft.run(SourceFile:689)
at java.lang.Thread.run(Thread.java:636)
Stopping!
Also tested with ULV cables, same result, same error.