I'm a Bryce 5 newbie. With many of my images, my horizon is in the exact center. I like it to be either a third from the bottom or a third from the top. When I move the camera, the angle of the scene is modified, but the horizon stays in place. Any suggestions?

use the little hand thingie at the bottom right

Change the camera mode. I like center to selection, so that way the camera revolves around whatever's highlighted. You could use the hand thing like suggested above, but if you do any major movements it tends to skew the picture (in camera and director views.) Moving the image using the scene movement tools on the left side shouldn't skew things like the hand does.

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Barbequed Pixels?

Your friendly neighborhood Wings3D nut.
Also feel free to browse my freebies at ShareCG.
There might be something worth downloading.

Or you can adjust your view using the trackball while in director view (I like this more than the camera) and then, if you want to make more precise adjustments, click "Camera to Director", select your camera and move from that. Stefano