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When I upload a new avatar (or change), the link in the stream is broken. I checked the urls:
In the stream the tumb is showing (.../images/avatar/thumb_552128b0e7a703afd9ba250c.jpg), but the stream-image is missing (...//images/avatar/stream_552128b0e7a703afd9ba250c.jpg). What I did find in the folder was an another file (.../images/avatar/profile-552128b0e7a703afd9ba250c.jpg).
I checked the profile, the avatar image is showing (.../images/avatar/552128b0e7a703afd9ba250c.jpg?_=1425469386).
It seams the stream_XXXX.jpg file is not written. This error occured after upgrading from version 3.1 to 3.2.1.6.
Ehm, I suggest you wait the stable Jomsocial version 4, because in JS4 RC2 this issue is working fine.. for time being you can disable the stream for upload new avatar, you can do it from user points configuration..
I forgot. I tested the change of the avatar. It works, but on top of the page I got this error message "JFTP Store". I saw you also changed the admin avatar. Did you get the same message.