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maybe an easier fix is to detach the top & bottom in your modeler?..as in this obj exported from 3dsmax,it;s still one mesh but the top verts aren't attached to the middle ones
http://stefan-morrell.com/cyl_test3.obj
I dont think planar mapping a cylinder could be regarded as a fix,when it creates uv mapping you cant use.

it is an odd problem though,I tested myself & your right,with no uv mapping it loads without artefacts

we know that fix ;) if you check out the other thread this was spawned from, we're trying to work out why we get the artifact and how to fix it.. and whether it is a bug that is in poser.