I'm having the same issue. It just started for me this afternoon. Prior to that I had been using the new interface just fine. It's not browser or machine specific. I normally used Firefox, but tried it on Chrome with the same results. I tried a different computer, and the results were the same. I also tried tried and true solutions like clearing cookies and cache with no success.

I, however, didn't realize that my videos were uploading each time I tried. The above note made me look at the video manager and to my horror I found they had all uploaded and were public. I deleted all except the first.

Can somebody fix this or come up with a workaround?