I recently installed IC2 on my server (it's Bukkit, but I don't think this error is related to that) and now I can't open any Iron Furnaces. I get an ArrayIndexOutOfBounds exception: 37 (I'll post the error in a moment) whenever I right-click the furnace on the server.
EDIT: Okay, caught the error.
java.lang.IndexOutOfBoundsException: Index: 37, Size: 37
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)