[support] Upload Progress Bar doesn't works in Drupal 7

[Jose Legido]

Hello.
I have a Drupal 7 installation with PECL uploadprogress in php.
I have selected  in "Progress indicator" the option "Bar with progress
meter" but when I add content and upload a file, doens't works, only
shows "Throbber"

What's the problem?

Thanks!