Sometimes when trying to setup an appointment through VSTAR Portfolio Calendar, the “Confirm Meeting” button is either missing or doesn’t work.  This seems to happen when there are more than a dozen or so meeting slots and you scroll down to see more times.  Occasionally when scrolling with the inner “Calendar” scroll bar, the outer bar will suddenly ‘snap’ to the bottom, and when that happens the “Confirm Meeting” button disappears or quits being ‘clickable’.  Or if you scroll to the bottom using only the outer main-browser scroll bar, the button disappears or quits working.   In either scenario, scrolling back up a little with the outer scroll bar and then back down with the inner scroll bar seems to bring the button back and make it functional.  If this article doesn’t help, please create a Help Ticket at https://spark-help.app.vumc.org/
Here’s a brief video demonstrating the problem and work around: