Rocket Science causes texture pack switching to break to:
Code
java.lang.IllegalArgumentException: input == null!
at javax.imageio.ImageIO.read(Unknown Source)
at ur.a(RenderEngine.java:906)
at ur.b(RenderEngine.java:854)
at bq.a(SourceFile:126)
at ge.a(SourceFile:152)
at df.a(SourceFile:65)
at iw.b(EntityRenderer.java:882)
at EntityRendererProxy.b(EntityRendererProxy.java:15)
at net.minecraft.client.Minecraft.run(SourceFile:689)
at java.lang.Thread.run(Unknown Source)
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This happens with both optifine and nonpatched nonhd texture, but oddly does not with mcpatcher.