JavaScript conflict on change-avatar page, French site

Hi
W3 Total Cache create a JavaScript conflict on profile/change-avatar/ on my French language WordPress/BuddyPress site.
When I change language and revert to English, everything is fine.
When I change it back to French, I can’t access to the upload button: it just don’t work.
When I deactivate Javascript on my web browser (either Safari or Firefox), then I can access to my upload function.
So is there any fix to make it work for all?
Thanks