driving me crazy - just want to start simulation at frame 3000 - I key frame the simulation at frame 1 to start at 3000 go to frame 3000 run the sim and my skelington hits an object in the camera window and the object flies off but when I run batch render the collision doesnt happen, if i restart computer delet bullet system and generally flush things it might work for a while but then stops working and I have a deadline and very unhappy - im not a mathermatician - i can only think theres something wrong with my machine or some cache somewhere which is not working if i keep the sim starting at frame 1 and key frame my object to have zero mass to frame 3000 then give it mass - it still doesnt work it doesnt even work if i try teh skelington and object which is a dynamic rigid body with the sim starting at frame 1 but does occasionally im sure theres a simple solution any one help?