Hi,
I read  the preceding post but no solution is explained.
 
I just upgraded from version 6.0 to 6.6. I work with FF 3.6.2 and IE8.
 
When I click on the Upload files button absolutely nothing happens.
 
When I do the same on your online demo version (EnableAll.php), it works perfectly. I tried in the editor in the forum, it's not the same button but it works also.

 

Any idea ?

Regards,

AleS