I've had a look at the file you've posted in scene-files. It isn't much help
when you post a working scene, cause that won't help me much in determining
the problem you're having with the problematic-scene.

What you might want to try though: If you don't have much experience with
photons, don't tinker with the default settings, for example: why are you
setting "radius"? Do you know what it's supposed to do and what it changes
with the new setting?

For another, I never use a modifier with the "target" keyword, but that's
more personal preferance than objective fact.

Finally: if the scene isn't working as expected, try narrowing it down.
Remove objects which you clearly know shouldn't affect the lighting (e.g.
objects which don't throw shadows on the glass-object), and tinker with the
transparancies of other objects.

Those are just general thoughts, now to some more specific stuff: "collect
off" will only stop photons from being deposited on a given object, photons
will still get refracted/reflected and they still deposit on other surfaces.
You're also using dispersion on your glass-object. Though it is a neat
effect, I've personally never achieved an effect worthwhile with it,
especially considering the amount of photons it would need to look really
good. It might be that I'm too dumb to make proper use of it, but I've just
used "normal" photons, and it works fine for me. You might want to switch
dispersion off for a few tests, just to see if that changes anything.

That's about all I can say which might help in finding the problem. Maybe
try a different camera angle, perhaps something in the scene isn't where
you're thinking it is, and thus it screws things up.

Regards,
Tim

-- 
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>

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