Appointments+ "Show Available Dates" button disappears, not usable

Due to the fact that the Plugin Dropdown on this form is currently not working, here is my question:

The Appointments+ plugin is set up for equipment rentals on this site. However, the "Show Available Dates" button does not show up. It briefly displays and then disappears. I have had to make the text long enough to show the "More Information.." link so that it can go to the individual items page.

How do I get the "Show Available Dates" button to appear every time next to the drop down for selecting service?