No they are not lost.
1. I have done exactly what you could have been doing but i still got my Litecoin address back every time. But when you enable your litcoin address once again. There is an option of "click to initialize" that always comes up. Did you click to initialize?
If not try disabling and enabling and see if it works
2. IF all fails. I hope you already have your seed phrase backed up. Clear the cache or data of the app. If on PC delete and reinstall the app, recover your wallet using the seed phrase. This should work.
Emphasis on first making sure
you backed up the right seed phrase before you delete your app.