Please help! I'm making a kinetic type video and the camera movements change in between the keyframes I set up. For example; if I want the camera to just shift to the right, I copy the frame position, and then change the X axis. When I switch between the two frames everything is right, except the frames that AE makes up in between is also changing the Y axis... but the Y is the same on each keyframe. I've tried looking everywhere for help, everywhere in the program, tried re-doing it mutiple times, restarting AE, ect and I cant figure it out... Please help!
You have a "boomrang" effect, and this can be corrected easily. Select your keyframes, right click and go to "Keyframe Interpolation" and select "linear".
In the preferences menu (edit > preferences > general) you can check the preference "default interpretation to linear" wich is unchecked by default.
Also, one of the neat new feature of AE CS4 is the ability to separate dimensions. It's really time saving when animating cameras or complicated x,y,z mouvement. For that, select your position property, right clic and select "separate dimension". Now you will be able to animate the x,y,z property independantly.