I just created a profile and uploaded an avatar. That worked. I then wanted to change my avatar to a different PNG file.
In "Update profile" I chose the new file (the new filename was displayed, then) but saving the changes does not actually change the avatar to the new image. It remains at the old one.
Am I doing something wrong or is this a local / browser problem?
P.S.: Maybe there is just a (long) delay in updating the avatar. Looking at the forums a few hours later, I can see the second avatar I uploaded. When I then uploaded a third version, it does not show up. Let's see if it is a reproducible matter of an update latency.