Have you tried the old 'unplug and plug back in' technique?
No, but curiously now it's giving me a different error message:
//edit: restarted all the machines, didn't fix anything.
Gotta love those extremely insightful error messages
I rolled the whole thing back a few days, now upload works, but I can't export to certain formats, namely GDB and GeoJSON. The mystery deepens, and so do the error messages. Error error, failed, failed.