Heh, it's starting to feel personal, since I've seen other uploads happen today, but I keep on hitting this error (tried 6 times now, with clearing my cache between tries, and even logging out and back in, in case it was a user session issue). The error is clearly a server-side error though, so I don't actually thing it is client (browser) based, but I tried those troubleshooting steps just to be thorough.
It's still an issue for me though.