Hi,
This happens rarely in some websites, and it is all about jQuery Conflict when the SEF URL is activated. You would notice they will start working if you disable the SEF URL feature from joomla Global Configuration.
I have the patch for this, but it is little complicated to provide here, if you provide me your joomla admin account to This email address is being protected from spambots. You need JavaScript enabled to view it., i will apply this patch to your website and make everything ready for you.
(while emailing to This email address is being protected from spambots. You need JavaScript enabled to view it. don't forget to include this forum post's URL at top of your message as reference to avoid any possible confusion in our end.)
Regards,
Forum Support.