Hello,
 I've managed to get a close-up of one of those sphere_sweep bugs. It might
help.
It is a half-transparent hole inside the sphere_sweep where the ray is
nearly normal to the central curve and some hyperbolic shaped pieces
asymptotic to [camera ray]x[sphere_sweep spine] where these are
perpendicular.
 Here's the scene:
http://honnza.no-ip.org/sphere_sweep_bug.png
http://honnza.no-ip.org/sphere_sweep_bug.pov
It's worthwhile that the hole looks different with different AA settings.
Also, the hyperbola doesn't show up when looking from <-3,0,-5>/6

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