Python Export and bezier curve animations

Dear all,
I am trying to export an animation to m3g format using the python script supplied by Nelson Games. It works fine when I do ‘normal’ animations of meshes moving around etc, however when I use it to export a Bezier curve animation, nothing appears in the resulting m3g file (ie it doesn’t appear in the J2ME app that is meant to display it) Do I need to tweak the python script or is there something I need to do to the .blend file?

Thanks in advance