I found what could be a possible bug in the system. I am using version 5.5 build 1588.
When setting the StartTime or EndTime attributes presentation to "Display time separately" with "Support recurrence" selected on the form, I can't get the recurring options to showup on the Appointment form. I'm also using the "interval", "min. value" and "Max value" options on StartTime and EndTime attributes.
Has anyone else seen this issue?