just using the scanline renderer with 2.5 star on. cant remember if i changed the padding. this could be the issue here. also am guessing the normal maps dont show in scanline render? or atleast i couldnt get them showing on a "standard" mat.
What settings are you at? If you baking with Scanline, it shouldn't be an issue (just enable 2.5 star sampler and be done), with MR on the other hand, you really need to bump up the settings. AO maps will require 128+ rays, and samples of 1-4+. For the seams, are you using padding? Max requires atleast a padding of 8+.