Comment 3 for bug 1273172

I noticed that it seems to happen only when the spheres are geometrically tangent or nearly tangent (you can try this by modifying the radius into the script).
I looked at the code and the problem seems to come from the "updateProperties()" method, it seems that "state->ori" is NaN. It comes from the inertia tensor eigen vectors, if some values are NaN (see the comment line 205 : "has NaNs for identity matrix??").
As this is a *very* special case, I change the bug importance.