This is not the only problem with the machines, so I'll do my best to explain it clearly..
I created an extractor, tried to add a RE battery to it. Nothing was happening, so I took it out.
Then I threw a few items into a chest, and changed my inventory a bit.
I then went back to the extractor, and several items in my old inventory were in the extractors storage slots, and also showed me my original inventory (before I put items into chests, etc)., and changed back to normal after i closed the machine's GUI.
So I decided that I would open the extractor again, and move an item in my inventory to another slot, when I got this message:
[WARNING] Failed to handle packet: java.lang.IndexOutOfBoundsException: Index: 40, Size: 39
java.lang.IndexOutOfBoundsException: Index: 40, Size: 39
at java.util.ArrayList.RangeCheck(Unknown Source)
at java.util.ArrayList.get(Unknown Source)
at ev.a(SourceFile:128)
at mk.a(NetServerHandler.java:798)
at rw.a(SourceFile:28)
at qo.b(NetworkManager.java:353)
at mk.a(NetServerHandler.java:69)
at fj.a(SourceFile:108)
at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:558)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:439)
at dm.run(SourceFile:490)
That's about it, thankyou :>