PICKING PROBLEM

ok. i’ve tried setting up a picking routine using a few tutorials that i have found on the net. the problem is, is those seem to only work on programs with a fixed camera, and rotating objects in that view. Well, my program sets up the world, then the camera moves around in and out of the world. Can anyone give me any ideas why this is not working? I can give you the code if you need it.

www.gametutorials.com
has an example IIRC
there should be no problem if the camera moves or not, the picking code should have the same setup as the draweing code