Approved user images not showing

Hi there

I have avatars set to require moderator approval.

I just approved all the uploaded avatars - but the default "avatar pending" image is still showing.

However, looking at the user profile in the back end, the new avatar does show.

I've cleared my browser cache and site cache, and tried from Chrome and Safari. I am using Joomla 2.5.24 and CB 1.9.1.

Any ideas what could be causing this?

Thanks so much.