irradiance/background bleed?

[s0real]

hi.
i'm trying to render out an image but i'm getting what looks like bleed through from the bg image...

i'm using the same image as the bg in the GI override and reflect/refract override in Vray Environment.

i thought it might be to do with the stored ir map, so i dumped it, but i'm still getting the same result...

i've got the advanced ir mode on 'single frame'
should i have it set to something else??

what am i doing wrong?

[J_Bug]

Are you using Screen?

If so, the easiest way to get around this is by setting your Environment override to Spherical Environment.

--Jon