Was trying to look up centrifuge recipes, and I got this, after clicking the left/right arrows a few times.
---- Minecraft Crash Report ----
// You should try our sister game, Minceraft!
Time: 12/16/12 10:25 PM
Description: Ticking screen
java.lang.NoClassDefFoundError: codechicken/nei/DefaultOverlayRenderer
at ic2.neiIntegration.common.GradualRecipeHandler.hasOverlay(GradualRecipeHandler.java:140)
at codechicken.nei.recipe.GuiRecipe.refreshPage(GuiRecipe.java:236)
at codechicken.nei.recipe.GuiRecipe.c(GuiRecipe.java:141)
at net.minecraft.client.Minecraft.l(Minecraft.java:1541)
at net.minecraft.client.Minecraft.J(Minecraft.java:858)
at net.minecraft.client.Minecraft.run(Minecraft.java:783)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: codechicken.nei.DefaultOverlayRenderer
at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:76)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 7 more
There was more...but there's a character limit, and it goes way over. Just say if you need to see it and I'll post it.