Curiously, the same thing happened to me about a week or so ago, causing heavy chunk lag until it stopped. I was able to track its "progress" by Forestry's apatite generation logging, but I couldn't determine if it was an entity or anything.Does anyone know what might have caused this pattern of chunk generation? The line goes right through 0,0.
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... do you have Mystcraft installed? Could this be a result of the profiling?