Hello! I understand you're having trouble with highlighting words on cards in the Gizmo app, and it shows an error saying "failing to highlight words." Could you tell me a bit more about this issue? For example:

- When did this problem start occurring?
- Are you trying to highlight multiple words or just single words?
- Is this happening with all your cards or only specific ones?
- Have you tried any steps so far to fix it, like restarting the app or your device?

This info will help me guide you better. Meanwhile, I can offer some common steps that usually help resolve such issues:

1. Restart the App: Close Gizmo completely and reopen it. This can refresh any temporary glitches.

2. Log Out and Log In Again: Sometimes, syncing issues cause problems. Logging out and back in can refresh your session and fix that.

3. Check for Updates: Make sure your Gizmo app is updated to the latest version; updates often include bug fixes related to features like highlighting.

4. Clear Cache: If the app allows clearing cache or temporary files on your device, doing that can clear corrupted data affecting highlights.

5. Try Different Cards: See if the issue is specific to some cards or all cards.

If you've already tried these or the issue still persists, I can dig into more detailed troubleshooting steps or check if there are known issues with the app recently.

Let me know what you’ve tried or any additional details, and we'll get this sorted!