drifterlee, have you unchecked the texture filtering on each texture in the material room? P7 automatically turns filtering on, and it's now a texture-by-texture option, rather than one choice on the render settings screen. Several people have complained about the effect this has on their renders, with seams and all sorts showing up. I seem to recall that stewer (I tihkn?) wrote a python script which turns off all texture filtering in all textures being used with one simple button click - might be worth a hunt.

Hope this helps,

jonthecelt