Appointments Plus not allowing other services to be scheduled

The appointments plus plugin on the above listed site is not functioning properly. For example, when the calendar is clicked on, nothing appears to the client. It appears fine if one is logged in as an admin but non admin individuals cannot view that page. Secondly, it isn't allowing any other services other than the 30 minute service to be scheduled. I've tried many different settings options and nothing has worked. Please advise on how to fix this.