also sometimes when i press the play button the model wont run and the play button wont look like it was depressed. Also sometimes objects in my drawing wont move, even though they are componets. I dont have access to my drawing currently but will have it tomarrow and will post it. Thanks

I made a ramp using regular sketch up. then I made a sphere using sketchy solids. but when i turn the ramp to a componet and but the sphere on top, the ball goes down a little then just stops. So i move the ball so its right on top of the ramp. then the ball floats upward. any idea how to fix this?????