Yes, I have a solution. The first thing you do is close Walk Designer and never-ever use it again. Next open the Animation Controlls at the bottom of the screen and start animating!

I played around with Walk Designer way back when I first got Poser 3. I haven't touched it since. It will only help you to produce buggy, repetative walk/run/stagger motions...it will not help you to learn how to animate.

I know this wasn't the kind of answer you were looking for (and of course it's not the only answer) but I hope this helps.