Freezing on Firefox and IE9 not Chrome

Hi,

On my appointment pages once I click forward a month or week (depending on view) it stops you from selecting or changing anything. Or in other words when you click dates or try to change service providers nothing happens. This is just on IE and Firefox.

Things I've tried -

- Setting up new appointments page with no changing to the auto code.
- De-activating all plugins and activating back on
- Changing themes both buddy press and non buddy press (I'm currently using a WPMU theme)
- Turning CACHE on and off
I'm also getting the same error on your demo page - http://appointmentsplus.org/make-an-appointment

Please help