New Category: Player problems

I have the impression that there is an increasing amount of threads that ask how to solve problems with players.
Usually this is detected that a player does not show the expected result.
Typical is that an update of the tag content is not detected, the sorting order differs from that in MP3tag, the covers in the player do not match that in MP3tag, the player cannot cope with multi-value fields.
And almost never can MP3tag overcome the deficiencies of the players.
I would like to have a collection of threads where readers can have a bundled look at player problems.