Sim not running after reopening

I solved yesterday’s issues with the rigid body sim but now face a new one. Opened the project this morning and the simulation won’t run. I freed the bake, then hit ALT A and nothing happens. When I go to the scene properties, everything is still good. Same for all the active and passive objects. Is this a bug?

Hard to say without seeing the file.

I updated to 2.73 and it still didn’t work. I ended up importing my objects and rebuilding the sim. Working great now