Hi there! I see you're experiencing a green screen when trying to load the Vita Mahjong app on your Android device with WebKit browser. Let's work together to get this sorted out.

First, can you tell me if you've tried any troubleshooting steps already? For example, have you tried restarting the app or the device, or checking your internet connection? This will help me avoid repeating anything you've done.

Meanwhile, here are some common steps to fix screen loading issues like a green screen in the Vita Mahjong app:

1. Restart the App: Close the Vita Mahjong app completely from your recent apps and open it again.

2. Clear App Cache:
- Go to your device's Settings > Apps > Vita Mahjong.
- Tap on "Storage" and then "Clear Cache."
- Do not clear data yet, as that might erase your progress.

3. Check Internet Connection: Ensure you have a stable connection—Wi-Fi or mobile data without interruptions.

4. Update the App: Sometimes, such issues arise if the app version is outdated. Go to Google Play Store, search for Vita Mahjong, and see if an update is available.

5. Reboot Your Device: A quick restart of your phone can resolve temporary glitches.

If after doing these, the green screen still appears and the game doesn't load, then we can try advanced fixes like reinstalling the app or looking at permissions/settings on your Android 10 device.

Would you like me to guide you through the cache clearing and update check? Also, let me know if there’s any error message or if the green screen happens immediately on launch.

Looking forward to your reply so we can fix this for you!