I created some text, added a lattice to fit around it, did the parenting, and gave the lattice a soft body. When I drop it onto a collision plane the text bounces in the desirable rubbery manner.
When I render it, without Motion Blur, it renders fine. But when I check the Motion Blur box in the render settings in the Properties I get a sort of faint trail of the text and no text, or at best a ghost of it. And the trail seems to long too match the motion blur. The Motion Blur settings are the default; Position is Center on Frame, Shutter is 0.5, no curve set, shutter type is None.
Is there some setting I need to change?