Rasterizer + refractions = edge problem

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  12 December 2009
Rasterizer + refractions = edge problem

Has anyone come across this before?
Where a semi transparent object with refractions turned on touches another object, it creates a fine black line which is visible in the alpha as well.
That happens only with rasterizer. I've tried increasing the samples, but that just raise the render times.

Alpha channel on the left.
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