Been following the tutorial, and on Post 9 (really post 11; not sure of step number at this point), it has the above instructions. Does the bump map layer on itself to five mean to apply the bump map effect to the layer 5 times (I think it does, but that gives me something that's much darker than seen in some of the land regions later on in the tutorial).Create a new layer called “Dirt” and fill it with the “med dirt” colour. Add some noise (Filters->Noise->HSV Noise):
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Now bump map this layer on itself to five a bit of lighting texture:
Edit: Ok, it looks like the five might be a typo, and meant give instead. I only applied the bump once, and it turned out nice so far. I'll post current status in the WIP forum (just before the mountains stuff).