Motion 3 Won't Open After Installing

Hi,

I reinstalled Motion 3 after doing it 2 days ago because the beach ball keeps coming up and never leaves causing me to force quit. I let it stay up one night and when i awoke 8 hours later it was still up. thus, i reinstalled after trashing it. there's never any motion files in the library to delete and no motion files in the receipts. this time it won't open after installing it and booting down computer. I have lion 10.7.5 the fcp studio disk that i install for motion says version 3 but could have sworn on the computer when it was working it said motion 4. Any suggestions? did all my software updates too.

Thanks,

joe