PECL uploadprogress installed - but no progress bar, just spinning gif
Managed to solve this by changing the widget type of the field - back to normal 'File'. Then if you go to the manage field display for this, you should now have an option to set the progress indicator to either 'Throbber' or 'Progress Bar'. If you select progress bar, then flip the widget type back to drag n drop module - it seems to do the trick. Cheers