Hi there! I understand you’re seeing a black screen when trying to run the Rise of Castles app on your Windows device using WebKit. To help you best, could you tell me a bit more? For example:

- When exactly does the black screen appear? (Right when you start the app, after some loading, or during gameplay?)
- Have you tried restarting the app or your device already?
- Are there any error messages, or does the app just stay on black without any response?

This will help me guide you through the right steps. In the meantime, here’s a simple step-by-step approach to troubleshoot this problem:

1. Restart Your Device and App: Sometimes, a simple restart resolves temporary glitches.

2. Check for Updates: Ensure your Rise of Castles app and Windows are fully updated; outdated software can cause loading issues.

3. Clear Cache and Temporary Files:
- Press Windows key + R, type %temp%, and press Enter.
- Select all files in the folder and delete them (skip the ones that can’t be deleted).
- Then, try launching the app again.

4. Graphics Drivers Update:
- Since graphics driver issues often cause black screens, update your GPU drivers:
- For Nvidia, AMD, or Intel graphics, download the latest drivers from their official websites.
- After updating, restart your computer.

5. Check Background Apps: Close unnecessary programs that might conflict with the game, especially browser extensions or security software.

6. Run the App in Compatibility Mode:
- Right-click the Rise of Castles app shortcut or executable.
- Select Properties > Compatibility tab.
- Check "Run this program in compatibility mode for" and select Windows 8 or 7.
- Click Apply and try launching the app again.

If none of these work, you might want to try running the app in windowed mode if that option exists, as sometimes full-screen mode can cause black screens1.

Could you try these and let me know where you get stuck or if the issue persists? That way, I can assist you further.