With my last three uploads, I've noticed some strange things going on when you're trying to upload from deviantArt:
1-In one instance, it didn't catch the full-sized version of an image when you did a source upload.
2-In *three* instances, I would get a weird error (lots and lots of code filling up the screen) when doing a source upload - the kind you'd normally find when the DA link had a mature filter turned on. Except, of course, they didn't. Saving the image and uploading directly from your PC works fine though.
I'm not sure if it's just me, or if it's some tiny bug going on in the background - it's really not even *that* bit of an issue, but I still think it's worth checking out.