Hi @Louise_Guy
We would like to welcome you to the king community. Thank you so much for being willing to joining 😊
We're very sorry for your problem.If you change the password on Facebook or the Kingdom without logging out the game, the game app is more likely to be corrupted. In that case you must reset or uninstall App, Without doing this you cannot connect the game with server.😭
You will lose the fully stocked boosters.
If the device is Android, you can try clearing the Cache.
Welcome to the Candy Crush Saga Community
Do you have a question or need help with your game? Ask the Community.