If you're unable to upload video to 6tag, you're not the only one, as Rudy Huyn mentioned on Twitter yesterday that the servers dedicated for video upload were being taken down for maintenance. However, it looks like the main server encountered a glitch, leading the developer to migrate servers. The good news is that the servers should be back up and running sometime later today, with a higher quality video encoding option to boot.
Full story from the WindowsCentral blog...