Like some other people I can't upload any new work, at all. I get sent to an error page.
In the mean time my art is being uploaded to my website and Flickr. I've got another piece I'll be uploading within the next 24 hours (most likely later tonight though).
Link
Amber-Aria
Just thought I'd let you know that according to their twitter, the problem's been fixed!
https://twitter.com/weasyl/status/534378459791769600