Sometimes Youtube take down their API for maintenance and uploads from 3rd party tools (like uMusic) will not work during the maintenance.
If this is not the case, I would recommend only using single words in the upload fields and see if that works.
Are you sure that you authenticate correctly?
Message box with Authenticating inside it is the beggining of the authentication, if no error message occurs, then you are supplying correct credentials.
The only time I ever got through all of the check boxes and didn't have a video uploaded was when I put more than 1000 characters in the description field.
Another suggestion is to seperate the tags with commas.
I hope this helps.