Bug Direwolf20 1.1.1 unstable

[Yuraj]

Hello,
I have upgraded from 1.0.3 to 1.1.1 and I got this crash (randomly) after accessing (maybe does not matter) AE terminal,

[18:00:54] [Client thread/INFO]: LWJGL Version: 2.9.1
[17:34:36] [Client thread/FATAL]: Unreported exception thrown!
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
    at java.util.ArrayList.rangeCheck(Unknown Source) ~[?:1.8.0_31]
    at java.util.ArrayList.get(Unknown Source) ~[?:1.8.0_31]
    at net.minecraft.inventory.Container.func_75139_a(SourceFile:104) ~[zs.class:?]
    at net.minecraft.inventory.Container.func_75131_a(SourceFile:390) ~[zs.class:?]
    at net.minecraft.client.network.NetHandlerPlayClient.func_147241_a(NetHandlerPlayClient.java:1056) ~[bjb.class:?]
    at net.minecraft.network.play.server.S30PacketWindowItems.func_148833_a(SourceFile:49) ~[go.class:?]
    at net.minecraft.network.play.server.S30PacketWindowItems.func_148833_a(SourceFile:11) ~[go.class:?]
    at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212) ~[ej.class:?]
    at net.minecraft.client.multiplayer.PlayerControllerMP.func_78765_e(PlayerControllerMP.java:273) ~[bje.class:?]
    at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1590) ~[bao.class:?]
    at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:961) ~[bao.class:?]
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:887) [bao.class:?]
    at net.minecraft.client.main.Main.main(SourceFile:148) [Main.class:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_31]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_31]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_31]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_31]
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.11.jar:?]
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.11.jar:?]

Also noticed more fps lags/lower fps. I am back on 1.0.3 for now. Also some cover textures were mismatched after upgrade. I had fastcraft 1.19 on 1.0.3 too.
Edit: Lags fixed http://imgur.com/CTtMnHc

Edit: Windows 8.1 64 bit, GPU AMD Radeon HD 7610M, B960 CPU 2.2GHz, 8GB ram