Hello! I understand you're having some problems with highlighting in the JW Library app on your Android device using WebKit. Could you please share a bit more about the issue? For example, is the highlight not appearing at all, does it appear but can't be adjusted, or is there a delay or some other unusual behavior when you try to highlight?

In the meantime, I'll guide you through some common steps that often help resolve highlighting issues in JW Library for Android:

1. Restart the App: Completely close the JW Library app (make sure it's not running in the background) and then open it again. Sometimes this refresh fixes minor glitches.

2. Update the App: Ensure that you have the latest version of JW Library installed. Updates often fix bugs, including issues with highlighting.

3. Try the Highlighting Method:
- Touch and hold a word longer than usual (some users have noticed they need to hold a bit longer after recent updates).
- Once selected, use the handles to adjust the highlight range.
- Tap the Highlight button in the menu that appears.

4. Clear App Cache:
- Go to your device’s Settings > Apps > JW Library > Storage.
- Tap on “Clear Cache” (do not clear data unless you want to lose your personal notes or highlights).
- Open the app and try highlighting again.

5. Reinstall the App: If the above steps don’t help, uninstall the app and reinstall it from the Google Play Store. This can reset any corrupted files.

If these do not resolve the issue, please let me know if:
- The problem happens only with certain texts or all texts.
- You notice any lag or scrolling issues when highlighting.
- You have tested the app on another device or another app with text highlighting to rule out device-specific issues.

I'll be happy to guide you further based on what you find. Does this help so far?