I'm doing a project where i've held a load of particles (phone icons) in 3D space, by using Box and reducing the initial birth rate from 30 to 0 with one keyframe, and turning velocity to 0. Later in the animation i want the particles to fly off, i've tried to animate their position or the velocity, but nothing happens when i do more than one keyframe! If i create more than one keyframe on, say the velocity, ramping it up from 0 to 200, nothing happens, the particles stay at their 0 position. What's happening, is this a bug? I'm on CS3 on a Mac Intel.