Notice that there are two radio buttons (I have boxed them in sky blue) on the keyframe palette;  you either key only the selected element, or you key all elements of the selected prop/figure.  Be aware of how you have this control set, else you will either key things which you did not want keyed,  or fail to key elements which you *did* want keyed.

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5