Note: The tutorial has been updated after fixing some typos.
As I mention in the tutorial, there is a Render Bake bug in 2.44 (I’m on XP, btw). But for me, it doesn’t matter whether the first map has been saved or not. And by my understanding of the feature, it wouldn’t work without saving the first map anyway (image needs to be written to disk, to be read and then rendered).
I looked at that Max tutorial . . . just remapping the area of the seam and blending that with the original map may be more efficient. It would probably also help in avoiding any stretching in other parts of the texture. When I have the time, I’ll experiment with this method.
Feel free to include/link the tutorial . . . but I may have to find somewhere else to host the file, especially if it might get downloaded a lot (it’s on my employer’s company website right now).