Over the past couple of days I've had an issue where certain avatars and photos appear as a system icon with a question mark in the centre. (see below)
I'm running Safari on a macbook.
This happens randomly and refreshing the screen sometimes addresses the situation.
I'm also having the same issue when I click on photos. The pop up loads but if I try to scroll through the photos in a thread, I get the questionbox icon again and the never ending circle indicating the photo is loading. (photo below).