SilverLight
Brad, hate to be a pain, but are you sure: 1) your light is marked as
SHADED, and 2) you are rendering in FULL TRACE mode, and finally 3) it is a
light tight box you are using (other than the hole, of course!)? Any one
of the three would cause light to leak.
(are you using SV? – I'd have to check if these things were true in earlier
versions….) good luck.
–jp–