Reacting on my nespaper

My newspaper "De Standaard" changed ots site, and i don't seem to be able to react any more ( i tried, MUIOWB, IBrowse & Timberwolf.

For example here
http://www.standaard.be/cnt/dmf20130619_023#article-comments

clicking on the ipper right blue "19" "reageer" logo a dropdown shouild appear showing the previous reactions (actually this thread is closed)
I can see the dropdown from Windows 7 Chrome, but not for any of the mentioned Amiga Browsers.

What can be the reason ?
My html is not fresh enough to analyse the page source :(