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In V4, when rendering with the GPU, I'm getting a quite noticeable black matting on all my images with an alpha channel. These look to be 4 pixels wide. Starting with a light grey and progressing to solid black. The remove black matting function in PS doesn't do much. Defringe does work. In contrast, CPU rendering produces a one pixel light grey matte which I can live with or remove black matting works very well. This is a real problem. I've upgraded my graphics card and V3 to V4 ($1000) to reduce render time but now have to work extra in PS to eliminate the black outline. The image from Maxwell should be usable right from the program. Any tips?

Do you mean custom alpha? As custom alpha is not yet supported on gpu.

No I don't mean custom alpha, it's not supported. output mode =rendered png + embedded alpha

Yes, I can confirm that.
It looks like the alpha channel, when launched with GPU is bigger than with CPU.

Will try to fix it.
Thanks for reporting.

Best regards,
Fernando