Ilustrator CS3 OSX keyboard shortcut troubleshooting

Hi,
I have a little problem here, and I thought I'd drop a few lines here and see if someone else's got the same problem.

Software: Adobe Illustrator CS3
OS: OSX Leopard
Trouble: the keyboard shortcuts are missing. I don't know why. They originally worked for a while and all of a suddent they are gone. The only shortcuts that works are the simple ones like copy and paste (option + c, option + v, option +s etc.). but basicly the shift shortcuts (scaling) doesn't work, the alt shortcuts to duplicate objects doesn't work either.

any idea?

thanks alot.