Not positive I'm right about what you're describing, but I think it's the same that happened to me.
when I tried to look at the FP+ selection page to get a feel for it prior to my booking time, I only saw my name and avatar, even though my whole extended family is linked and I see their hotels and tickets on other pages. I wasn't planning to book right at midnight, but was still up, so I looked at 11:58 and still only my avatar/name was there. At 12:03 I refreshed and suddenly my whole family appeared and all the FP selection menus were there. If you want to familiarize yourself ahead of time, go watch a youtube walk through, and you can call tech support of you want to reassure yourself, but I think your stuff will appear when your window actually opens.
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