I've had it happen in Poser 7 usually when I am using props such as Jepes animated "billboards" and others with a transmap. When that  happens I end up rendering in Poser 4 rather than firefly and that usually fixes it.  But that clearly isn't what is causing it on yours (at least I assume you don't have any trans maps on those textures) so...

I've also had it happen when I mess around with the "Post Filter Size". Put back to "1" and "Box" if it is not currently. Then if that doesn't fix it, change it to gausian and/or sinc. But I usually find that anything other than the default of "1" and "Box" leaves those marks you are seeing.

Just in case you don't know, that setting is on the right hand side, near the bottom, of the render settings menu (under options) in Firefly.

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