Ok, I am having trouble with the rotation tool. When I put -90 degrees rotate and then click save picture, it leaves me with a blank page ??? nothing happened! any ideas?
You're probably running into server-sided restrictions (not Coppermine restrictions). Check the sticky thread on the uploads board (http://forum.coppermine-gallery.net/index.php?topic=24088.0): the server-sided settings mentioned there for uploads apply to cropping and rotation as well.
If only you (as admin) are affected, I recommend performing rotation on your client before upload instead of doing this on the server.
Has been asked before, search the board for details.