So it seems some other Trello Chrome Extensions are broken too. In any case, TrelloX should be fixed now, now I've worked out what the problem was 😜.
The long-term plan was always to convert TrelloX to an official Trello Power Up, however that will take time. Time I don't have as I'm focused on licorice.io right now. So I've worked around Atlassian's latest change. However I'll put an official TrelloX Power Up higher in my list of priorities.
If you have any problems with TrelloX version 1.4, please let me know 😊.
To the loyal users of TrelloX—sorry for the inconvenience.