Change PLONE site logo

After adding a new PLONE site, (I now have two sites), I followed the exact steps as I did for the first site to change the site logo. A new logo.jpg file was uploaded to the folder "Custom" under plone_skin. Then I restarted zope and loaded the new site. Much to my disappointment, the logo for the new site is exactly the same as the other site. No matter what I did, nothing changes. PLONE developers, why did you make this simple task so damn complicated?