Order Status Change Feature not Working

When i go to change the status of an order on the Order Overview page nothing happens. Initially once the drop down menu selection was changed a splash screen would appear with the option to email the customer and save the update. This no longer works.

I now have to click on the customer order to review the full order details, update the status, save, then go back to the Order Overview page to view and update the other orders.

Has anyone else experienced this? Is there a fix to re-enable the feature to work on the initial order overview page as it is quite time consuming to go into each order detail page to update the order status.

Jason