Hi,
Sorry for the issues you are having. I can help troubleshoot this with you.
I took a look at your site and see the same error in Firefox as well.
Looks like a javascript error is showing in my console.
Do you have any debug settings turned on your site?
If you do can you please turn them off and see if that helps.
Testing for Conflicts
Also if that does not work can you please follow our testing for conflicts guide:
Testing Conflicts With Themes and Other Plugins
That will help find out if there is a conflict causing the issue.
Let me know what you find out and we can go from there.
Thanks