Rigid body object animation won't preview or play? I have a simple rigid body animation that won't preview.
The diamond object docent react to the floor as it should when previewing. 
The Other 2 objects in my scene do react correctly. My blender file can
be downloaded here

https://www.dropbox.com/s/jv0fseluf3gsnam/Diamond%20test.blend?dl=0

Can someone help with advice on this please?
Run the simulation Alt-A until all frames have been displayed, this causes a real time bake. After that it should work fine.