Somehow your gui ids are different between client and server. Be aware, the defaults changed with IC1.42 and AM 3.0 because the old gui defaults for AM2.1 became iron and elec furnace guis in 1.42. So if you're upgrading a server, you'll need to change those numbers. The new defaults are now 40, 41 and 42.
Ah that explains it, I changed the GUIIDs for the iron furnace and electric furnace to 40 and 41. Thanks.
I get his error everytime I try to open the interface of a rotary macerator on a server, haven't tried the other machines yet since I don't have the materials, I assume it would be the same with them too.
java.lang.IndexOutOfBoundsException: Index: 39, Size: 39
at java.util.ArrayList.rangeCheck(Unknown Source)
at java.util.ArrayList.get(Unknown Source)
at pj.b(SourceFile:80)
at pj.a(SourceFile:232)
at abp.a(NetClientHandler.java:881)
at yh.a(SourceFile:42)
at hc.b(SourceFile:272)
at abp.b(NetClientHandler.java:81)
at ma.c(SourceFile:56)
at net.minecraft.client.Minecraft.k(SourceFile:1593)
at net.minecraft.client.Minecraft.x(SourceFile:705)
at net.minecraft.client.Minecraft.run(SourceFile:658)
at java.lang.Thread.run(Unknown Source)
