The icons must have worn off
I was recently on a flight and heard what was described as an odd announcement. In the in-flight entertainment system, some of the icons were missing. For example, one of the movie categories was not visible.
The category was still there, mind you. You just had to tap the blank spot where the icon would have been and then you could select the movie you wanted.
@Greybeard Maybe the icon CDN was down?