When I logged in tonight to make a change to a fast pass, my resort reservation was not linked, or my tickets or my fast passes. When I called into tech support they could not explain it. They got my resort back and struggled to get my tickets but told me I'm out of luck on the fast passes that I need to re-book.
I would assume that 99% of the time people get into their meet and greets just fine but I hate that there's that chance and that they won't take a screen shot as proof (though I have it screen shotted anyway just in case...).
I remembered Pete saying on one of the podcasts that he consistently had trouble with the app trying to make changes to FP+ in the parks on the fly, but had much less trouble online. So, I logged on to the Disney website and sure enough, all my reservations, ADRs and FP+ times were there. They really do need to fix this though...I still say a confirmation number for FP+ would be appreciated so that their IT system can at least have something to look up when these things disappear into the great void of MDE app land. 

