A very long story, short. (wanted to throw my computer out the window)
I encountered an issue trying to animate objects using Blender - enclosed an example.
I used shape keys to animate the tail wiggle, animations are baked.
The first shark has one material - wiggle ok.
The second shark has multiple materials - wiggle doesn’t work.
Does having multiple materials in one object break the shape keyed animation?
I’ve tried uploading the Blender file and using the Blender exporter - same results.