I've been having this issue for a while. When baking AO, using mental ray in 3ds max.
I've tried both 2012 and 2013, and they are both causing this issue. I've tried everything my search has yielded, and watched tutorials and followed them to the letter, but the issue seems to persist.
The issue is when baking AO, the render appears in the render window fine (albeit, without padding). The version of the file that it saves is completely solid black on the UV areas, the rest is white, as if there's no lighting.
While it would be fine to save from the render window, as I can do this and it saves fine, but the render window seems to ignore the padding setting and I can only paint the padding so much in PS.
Has anyone encountered this problem before? My google searches didn't reveal much.
Any other better way of baking AO could also work. Thanks in advance guys