I've got exactly the same issue!
When importing it into LW, the only thing which is animated is the light (and shadows) but the shape does not move at all...
I'm using latest version of Blender.
I'm creating the shape, add the bones, create the link between the bones and the shape, then animate it and save it in dope sheet, then export it with LW export plugin. All seems fine in LW, except what I've written above when I run the animation in Model editor window.
I've read several message on the subject in LW (and done the tips in it, like the scaling) but it did not help.
Have you found a solution pracedru? Or anybody else?