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Comments
Could be as well a repeat parameter not having a parameter on the edges.
It can be a corrupted artmesh/mesh deformer (usually happens with skinning!)
The way i use to find this later one is i go deleting half of the model (by folders) and i see if it renders i slowly do that into the full model and i can pinpoint the problem.
The last option is that could be you added WAY too many PSD's and you are running out of memory once you render C:
I hope any of these helps!!!