I, too, get a complete minecraft freeze when I log in. It was manageable at first because I could still do stuff for 10 seconds; now I'm completely stuck the moment I can move after logging in. I checked the original thread, and I'm 100% sure I saw a Slimy Tree in my neighbor's (suchtie/cmartinez) yard right before I became unable to login. Here's the last part of the message & errors log right before minecraft becomes unresponsive: Code: 2013-12-27 19:32:38 [INFO] [STDERR] java.lang.ArrayIndexOutOfBoundsException: 1 2013-12-27 19:32:38 [INFO] [STDERR] at mods.tinker.tconstruct.blocks.slime.SlimeSapling.func_71858_a(SlimeSapling.java:75) 2013-12-27 19:32:38 [INFO] [STDERR] at net.minecraft.client.renderer.RenderBlocks.func_94165_a(RenderBlocks.java:9010) 2013-12-27 19:32:38 [INFO] [STDERR] at net.minecraft.client.renderer.RenderBlocks.func_78599_a(RenderBlocks.java:3791) 2013-12-27 19:32:38 [INFO] [STDERR] at net.minecraft.client.renderer.RenderBlocks.func_78620_l(RenderBlocks.java:3661) 2013-12-27 19:32:38 [INFO] [STDERR] at net.minecraft.client.renderer.RenderBlocks.func_78612_b(RenderBlocks.java:420) 2013-12-27 19:32:38 [INFO] [STDERR] at WorldRendererThreaded.updateRenderer(WorldRendererThreaded.java:155) 2013-12-27 19:32:38 [INFO] [STDERR] at WrUpdateThread.run(WrUpdateThread.java:116) 2013-12-27 19:32:38 [INFO] [STDERR] java.lang.IllegalStateException: Already tesselating! 2013-12-27 19:32:38 [INFO] [STDERR] at net.minecraft.client.renderer.Tessellator.func_78371_b(Tessellator.java:481) 2013-12-27 19:32:38 [INFO] [STDERR] at net.minecraft.client.renderer.Tessellator.func_78382_b(Tessellator.java:471) 2013-12-27 19:32:38 [INFO] [STDERR] at WorldRendererThreaded.updateRenderer(WorldRendererThreaded.java:128) 2013-12-27 19:32:38 [INFO] [STDERR] at WrUpdateThread.run(WrUpdateThread.java:116) 2013-12-27 19:32:38 [INFO] [STDERR] java.lang.IllegalStateException: Already tesselating! 2013-12-27 19:32:38 [INFO] [STDERR] at net.minecraft.client.renderer.Tessellator.func_78371_b(Tessellator.java:481) 2013-12-27 19:32:38 [INFO] [STDERR] at net.minecraft.client.renderer.Tessellator.func_78382_b(Tessellator.java:471) 2013-12-27 19:32:38 [INFO] [STDERR] at WorldRendererThreaded.updateRenderer(WorldRendererThreaded.java:128) 2013-12-27 19:32:38 [INFO] [STDERR] at WrUpdateThread.run(WrUpdateThread.java:116) 2013-12-27 19:32:38 [INFO] [STDERR] java.lang.IllegalStateException: Already tesselating! 2013-12-27 19:32:38 [INFO] [STDERR] at net.minecraft.client.renderer.Tessellator.func_78371_b(Tessellator.java:481) 2013-12-27 19:32:38 [INFO] [STDERR] at net.minecraft.client.renderer.Tessellator.func_78382_b(Tessellator.java:471) 2013-12-27 19:32:38 [INFO] [STDERR] at WorldRendererThreaded.updateRenderer(WorldRendererThreaded.java:128) 2013-12-27 19:32:38 [INFO] [STDERR] at WrUpdateThread.run(WrUpdateThread.java:116) 2013-12-27 19:32:38 [INFO] [STDERR] java.lang.IllegalStateException: Already tesselating! 2013-12-27 19:32:38 [INFO] [STDERR] at net.minecraft.client.renderer.Tessellator.func_78371_b(Tessellator.java:481) And IndexOutOfBoundException in Tinker's Construct followed by an endless slew of 'Already Tesselating' exceptions. Full log here: http://pastebin.com/DjsQ2Mfy My character's name is 'trypsonite', by the way.
Known issue, hence why we've warned people about it multiple times. A moderator should be along shortly to deal with the issue.