The display artifacts shown in that jpg are intermittent. Their appearances depend upon where you place the mouse cursor in a viewport. Not all cursor locations produce the triangle. It's something to do with the v4 file (maybe a superfluous point in the definition of the largest shape), since the original (MoI) version doesn't show the problem. Something is confusing the renderer into thinking there is geometry to render.
Now for the odd thing I just discovered:
Delete any object from the model. Then click undo.
No more display artifact!!!
Unfortunately, after saving the model, then reloading it, the artifact is back.
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