Baked smoke doesn't render

Ok, running 2.5, Alpha 2, 27226.

Ran a Smoke sim, renders fine while cached. Baked the cache, re-saved the scene.

Exited Blender, relaunched Blender with saved scene – all the Baked frames load fine.

Tried another frame render, NO SMOKE! And no smoke showing in the GL 3D view either.

  1. Is this a bug?

  2. Does the domain material and voxel texture need to be re-entered manually?

  3. Do I need to rebuild a new cache with Alt-A (starting over!) or will the regenerated cache use the already baked data?