I upgraded from 2.4 to 2.5 and then 2.5 to 2.6 and everything looks ok until I get to the upload page where I select the video. Upon pushing the "upload" button, the following error is returned:

'show_files_uploaded' is undefined
What does this mean and how can I fix it? I wasn't having this problem before I upgraded. Should I revert to the older version?