I'm working on a full world map (expect massive ongoing maps and stupid questions as I proceed) for a project.

I have the map in Fractal Terrains. It looks great (well, it looks like a great start). What I need now is to get it exported at a ridiculously high resolution. Since FT won't address all my memory I'm exporting to image files and then stitching them together in Photoshop.

The stitching is no problem. It took me about 30 minutes once I got the image files exported, but then I noticed there was a pretty major issue with the image files themselves. For some reason, FT chopped off the top and bottom of the mercator projection when it exported the images so I'm missing the upper and lower 20 degrees or so of map (mostly water, but missing a few islands and the top and bottom of some continents).

I have no idea why it did so and couldn't find anyone else that had run into the problem. For now I made a new 'fit' projection and I'm trying to export it using the 'base on current view' option to see if that helps. Unfortunately, it takes almost an hour to generate the files due to their size and FT's memory allocation limits. I'm going to feel very silly if it does the same thing again. Any idea why it would do this and how to avoid it?

I would attach examples, but the stitched map is 2.5GB in photoshop >.< If needed I'll make a quick resize to show what I'm talking about.