This is due to Texture Filtering. Any time you see a texture map changing appearance as the distance to the figure varies, it is because of this.

Since P7, Texture Filtering settings were moved from Render Settings. They are now on a per-image basis, in the Material Room on Image_Map nodes. This behavior is a subject of some debate. Some CG pros insist that you are a fool if you disable texture filtering.

My experience with P7 texture filtering is this:

1. Poser 7 texture filtering is too aggressive in most cases.
2. Texture filtering causes small "shifts" in the final position of individual pixels. This results in visible seams.
3. Texture Filtering is great for avoiding moire effects in highly regular patterns, such as fine parallel lines. Disabling TF on such textures is a bad idea.
4. TF ruins the details in irregular patterns such as skin. Disabling TF on such textures is a good idea.

TF should have a "scale" parameter that I should be able to set to adjust the amount of blurring that happens at a particular viewing distance. This would permit us to adjust it to give the right balance between Moire reduction and texture fidelity. It would also then be able to deal with the fact that some images, such as skin maps, do not need to be heavily filtered even though the image is huge, such as 4K.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)