If your Happn app messages or crushes appear invisible or disappear, here are the main reasons and solutions based on the latest information:

### Why Crushes or Messages Disappear

- Invisible Mode: Happn has an invisible or discretion mode which lets users hide their profile for up to eight hours. If a user is in invisible mode, their profile won't show up for others during that period13.
- User Blocked, Deactivated, or Deleted Account: If you can’t find a previous crush or see their messages, it’s possible the user has either blocked you, deactivated, or deleted their account4.
- Profile Clean-Up After SuperCrush: When you send a SuperCrush to someone, their profile is automatically removed from your timeline to keep your Happn feed clean. However, if you have a mutual match (a "Crush"), their profile can still be found in your Messages section2.
- Privacy Settings: Users control their visibility. Your exact location is never shown—only crossing points, and you will not receive messages from users you haven’t liked back or interacted with58.

### Solutions

- Check the Messages Tab: If you’ve matched (“Crush”) with someone, their profile and your conversation should remain in your Messages section even if their profile disappears from your timeline2.
- Invisible/Discretion Mode: If you want more privacy, enable invisible mode to hide your profile temporarily13.
- Update App and Privacy Settings: Ensure your app is updated, and review your privacy and notification settings to avoid missing messages or seeing unexpected disappearances.
- Account Activity of Others: If a crush or message disappears completely from both your timeline and messages, the user most likely blocked you, or their account is no longer active4.

### Additional Tips

- When you’re in “Invisible Mode,” you won’t appear on other users’ feeds for up to eight hours3.
- Your location remains hidden; only approximate crossing points are shown to others for safety58.
- Turning off your GPS will stop the app from updating your crossings, but the app itself won’t function as intended3.

If you still have issues or suspect a technical problem, contacting Happn support directly through the app is recommended for personalized assistance.