just recently someone else clicked Zinvert and it solved it. I know i updated the wiki with that info. his was “changing the render order”. I know at first we susptected the old alpha premul halo thing, but this is different.
That’s weird. I’ve just rendered your blend file and didn’t get any artifacts. I rendered it on 2.43 (I’ve got the latest SVN on Ubuntu too, but I happen to be using Windows at the moment and haven’t got round to updating).