I'm not certain this is your problem, but a lot of times with an animation pack, the set will have a default starting pose when you load it (so it's seamless with the rest of the animation frames). If that is the case, you can save your figure's pose as you have it as a pose file, then apply the animation to a default figure (v4/Genesis) so that it shows up in the keyframe window. When you have that nailed down, merge your pose file with your figure and see if you get it where you want it. 

Run your mouse through the frame markers (if it loads any) or play the animation and see what happens. 

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