So, I've had this issue for a LONG time, but am only seeing the visual consequences now (i.e, nothing is visible at all.)
I have a few tags that I'll cycle through, and always have had imgur links to submit (which are still posted and active, the images haven't been deleted.) However, every time I try to change my icon, I get the message "Your details have been saved.
However, your avatar was not saved as we couldn't find it."

Am I missing something? Is there an issue with the tags themselves? Or is this a bug?
Any clarification would be appreciated.

Also, here are the tags in question, for reference: