Hi NN2RL,
Thanks for visiting Apple Support Communities.
If you do not see the right pictures from Aperture when using the Photo Browser, here's how to change the current Aperture library:
- Open Aperture.
- Choose File > Switch to Library > [library filename].
- If the library you are looking for doesn’t appear in the Switch to Library submenu, choose Other.
- In the dialog that appears, select the library you want to open from the list, then click Choose.
From:
Aperture 3 User Manual: Working with Library Files
http://documentation.apple.com/en/aperture/usermanual/#chapter=3%26section=3
You may need to quit Aperture and quit/re-launch Mail before you will see the right pictures in the Photo Browser.
Cheers,
Jeremy