I don't know if you guys got a notification, but most of the submissions should be back and working. If they're not showing in speedgrader, they should be available for download now. All of mine came back in one of those two forms, so hopefully they're all back for the rest of you as well!
I am having the exact same problem today as well.
Some of the submissions I am able to download and view, but some of them I can't.
It's only on submissions that were made yesterday. Everything else is fine.
Same with me, I had some resubmit and it had the same error. Can the docs ever be retrieved?
I've also been able to download some to view, but not all.
I am having the same issue today and it is happening to all submitted work. I can't download any of them. I submitted a support ticket and hopefully we can get this fixed soon.
This still hasn't been resolved and is getting frustrating as I can't grade any assignments that my students have submitted. Hopefully this gets fixed asap.