You've seen the memes and laughed at the tweets.
It's an embarrassing end to a saga that has dragged on for months as Manchester United claim to have sent through the documents just seconds before the end of the Spanish transfer window.
But this crafty Twitter user has another theory for what happened...
https://twitter.com/PeoplesPerson_/status/638607272050954240?ref_src=twsrc%5Etfw
Really, it's his own fault for using Firefox instead of Chrome.
