Pretty frustrating and somewhat disappointing experience today.
I'm on QF12 and had an upgrade request in (J-F). Been watching the loads on EF, a week ago the cabin was wide open. Nothing happened. I kept checking every day or so and watched as gradually some seats became vacant in 11-13 J whilst seats in F filled. I called the SST a few days ago to check that the UG was requested with correct priority (I had lodged it prior to getting P1). Was assured that it was. Overnight the request changed to "Declined" on the mobile site. There's two empty seats in F with EF showing QF selling F1.
I rang up the SST and they couldn't see that the UG had been "Declined" so they called someone to ask if I could have the upgrade. Still declined 
I'm not sure but I think maybe somethings gone wrong there somewhere in the system.
I'll follow up with the SST via email when I get back.
FWIW this is the first time I've had an upgrade request in and never at any point had a Ghost wait list segment appear.