[QUOTE=-Silver-]Either I'm using it wrong, or the action isn't working as intended.[/QUOTE] Neither
I know the action works correctly, because I use it so many times. For example in the example game "Verve!", or in the day-night-cycle demo of the Color Fusion (Masked) effect. Both of them downloadable (is this a valid word?) somewhere on the forums.
But I remember that I also had a lot of problems when trying to animate parameters of the warp effect. It seems to be the effect itself. Normally, I'd advise you to contact the author. But in this case it's Ashley, and I'm pretty sure he won't have time to look after it.
I'll send you a pm.