Here is a small test i did with normal maps and bump maps in Poser and 3ds max for comparison. Which shows the problems im having at least when using normal maps in poser.

3ds max Left: Bump map, Right Normal map, Main light is placed low in the scene.

Poser Left bump map, Right Normal map also using main light set low in the scene.

3ds max with main light high

Poser with main light high

The scene used in poser is the same as in max as its exported from there. Lighting are different, but think thats it ok to illustrate the problem. And also the camera might be slightly different.

In Poser especially in the render with main light low, you can see some weird straight lines in the render, which doesn't appear in the 3ds max scene, which are examples of the artifacts i experience when using normal maps in Poser. The bump map works fine even though you still get some lines in it. And again you can see the artifacts in the one with the lighting high, but not as much. So maybe its a problem with the poser lighting when using low poly mesh. The spheres only have 32 sides.

The poser normal map uses gamma of 1 and Tangent space.