Rotation problem - on your tool menu where it says Object Mode.  To the right of that about 3 icons over is one that looks like a double arrow with three dots over it.  If that is lit (highlighted in orange) try clicking it off.   This turns on the "Manipulate Center Points" feature which is handy in certain situations but if it is on you will not be able to rotate an object in Object Mode but you will still be able to do so in Edit Mode.  I'm guessing this may be your problem.

Materials problem - I've often had trouble with exporting Obj to Poser and getting it to read the materials correctly.  Generally Poser only seems to pick up whatever material was listed first.  If that happens to be your Normal Map then Poser will apply it as a Diffuse.  The problem isn't Blender, its Poser.