Appointments+ Working Hours (Day) will not update

When trying to set Saturday as a work day the day does not become selectable from the calendar.

On the "Working Hours" Tab I have changed

Saturday to "Yes" and set the valid times. Clicking "Save Changes"

When browsing to the calendar on the front-end to choose a time on a Saturday, saturdays are not selectable. Showing the (/) icon.

Any help would be appreciated.

Thanks