When the form opens (shows dentist appointments by chair) the icon appears that the very top in Chair 1. I can add a patient, no problem. When I click on an appointment in Chair 2, the icon appears in the last clicked appointment on Chair 1. When I then click on Chair 1 the icon appears on the last clicked appointment on Chair 2.
There is no problem with the A2003 version. I DO NOT use the Calendar icon in my application or any third party software.