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this occure only with UBC(0.6h11) together with other mods, but my impression is, that UBC just force the load.

while playing / running arround - > get chunk problems. In beginning with clientside chun ticking, later on this message spams log full:

[03:27:46] [Client thread/INFO]: Warning: Clientside chunk ticking took 191 ms
[03:27:47] [Server thread/WARN] [FML]: ****************************************
[03:27:47] [Server thread/WARN] [FML]: * There is an attempt to load a chunk (65,-22) in dimension 0 that is already being loaded. This will cause weird chunk breakages.
[03:27:47] [Server thread/WARN] [FML]: * at net.minecraft.world.gen.ChunkProviderServer.originalLoadChunk(ChunkProviderServer.java:154)
[03:27:47] [Server thread/WARN] [FML]: * at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:131)
[03:27:47] [Server thread/WARN] [FML]: * at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:101)
[03:27:47] [Server thread/WARN] [FML]: * at net.minecraft.world.gen.ChunkProviderServer.func_73154_d(ChunkProviderServer.java:199)
[03:27:47] [Server thread/WARN] [FML]: * at net.minecraft.world.World.func_72964_e(World.java:416)
[03:27:47] [Server thread/WARN] [FML]: * at net.minecraft.world.World.func_147475_p(World.java:2580)...
[03:27:47] [Server thread/WARN] [FML]: ****************************************

and later: warning occure on server side and than "full crash".

I tested it a whole RL day with every other mods and forge versions, fresh FTB-unstable instllations...