i seem to be having some issues with the latest version of the modpack. The first issue came up when opening the world were their was an ID conflict (aside from that which was to be expected) i also have been having problems with one of my chunks. I don't know why but whenever the chunk gets loaded i comes up with an error message saying "2013-12-12 18:26:44 [SEVERE] [MapWriter] data length (4092) or version (2) invalid for chunk (12, 5)" after that chunk loads my game get's lag spikes until the point it freezes and crashes. on top of that i can't save and quit the world and log back into it without the game crashing. I don't want to sound unappreciative to the great work of the FTB team in managing to get this modpack out as early as possible i just wanted to post the issues i have been having. In case you wanted the pastebin: http://pastebin.com/XjJCFXNa