ignore the boxes, they are from the other tests described.

Green - in all further images - cloth at extreme parameter settings (sheer damping 1000, density 1), showing artifacts at the edges. Yellow - a copy with adjusted parameters.

This image: extreme sheer etc settings but density at 0.0001. This is frame 100, after ground impact at frame 60. Note the Green cloth still shows considerable effects while the Yellow one is about flat. Note that the Green sheet shows effects at the front side only.

This made me infer that the simulation suffers from edge effects, and that density, or the extreme setting of it, might play a role. 

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Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

visit www.aRtBeeWeb.nl (works) or Missing Manuals (tutorials & reviews) - both need an update though