Cannot launch Aperture with second user

Hello

I am new to mac and hope that someone can help me.

I have Snow Leopard and Aperture 3, but when I add my wife as a second user, the iPhoto and Aperture application just would not launch under her account (but Safari, iTunes, Address Book etc are alright). Here are the settings (as far as I know):

- user type: administrator and standard (have tried both)
- Aperture sharing and permission: read and write
- fast user switching disabled

Is there anything else missing?

Many thanks