Just as new update became available to download we begun getting reports from users not being able to unlock the RC Plane 2 gift. Problem is affecting many users across most of AppStore regions, super sorry for this, an updated version is already on the way.
We have also found a bug with Arcade scoreboards display, update will fix this too, as well as bring further memory and performance optimisations.
Great thanks for your patience and constant stream of feedback which is constantly making the game better.