Tumblr technical Problem when trying to change avatar?

I've been trying to change my avatar every day for about a week. I used safari, firefox, and chrome. it loads for about .2 seconds then says their having a technical problem, try later. I've never known tumblr to have an ongoing problem like this. Is anyone else having this problem?
Update: or does anyone know if I can change it on a beta or mobile tumblr?
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