Obviously without seeing your phone it is hard however I think this is the problem. Reinstall Launcher Pro. Then you need to go on your App Menu and go on Homescreen selector. You then need to select Launcher Pro. I think it has 3 options and it sometimes shows the options twice. Both times select Launcher Pro NOT Launcher. If you have changed nothing you should see Orange Homescreen, Launcher (the standard Android Launcher), and Launcher Pro (Picture of a House I believe, or something Yellow). I have deleted Homescreen selector so I cannot check this, but I had this problem that it would ask me everytime I turned on the phone what homescreen I want. Try that, hope it is what you are asking.