Avatars are not showing up on site

When I upload an Avatar to my site, I get the message "The new group avatar was uploaded successfully!" However, the site always displays the MysteryMan.jpg.

I have a multisite installation of WordPress v. 3.4.1 and a BuddyPress Installation of v. 1.5.6.

Please help me resolve this issue! My site will not display uploaded avatars for groups or users.