I booked a flight a couple of days ago (DL 284) from LAX-ATL a few weeks out, this is domestic service but on a the 777 with 4 cabins, but all PS seats were already taken. I have FC/C+ upgrade marked on the reservation and went and set a seat alert on EF. Sure enough yesterday morning early (4 am) the alert says 2 seats avail (I just need 1). I got up an hour later and I go to the app and see nothing in the PS cabin and was thinking someone snagged the seat already. I double check my UG request status, and then went to check EF to see if the alert was still active (I'm new at this) and it was and showed the 2 seats still there! I read something here on FT regarding unchecking UG and rechecking so I decided to just try it before I called in. YEP, unchecked just the C+ ug and saved, then rechecked and saved and I was immediately moved to the open aisle seat...

Just a heads up that now that you can't even see what seats are open except the class you booked, you won't know what is there unless doing a dummy booking or using some other tool. If I didn't know about setting an alert I would not have seen the seats open up, and certainly wasn't upgraded to one. About as transparent as a brick wall.