Unknown Error Uploading Videos

Have wasted the better part of two days attempting to upload new video content, getting repeated "Unknown error" red messages. this is after the video has all of its hashes built, sits in the queue, snaps uploaded, etc.

Have used three different OS, four different browsers. Cleared cookies, hammered the video down via Handbrake until the quality was just about good enough for 3 year olds. Nothing works. Really trying to contribute to the platform!

HELP!