Hi there! I understand that after you see the Dragon Mania Legends logo, your game shows a black screen with many rectangular lines and then it closes. Let's see if we can get this fixed for you.

To start, could you tell me if you've already tried any of the following steps?
- Restarting your device
- Checking for game updates
- Clearing the game's cache or data
- Reinstalling the game

If not, I can guide you through these. Here’s a step-by-step approach based on common fixes for this type of issue:

1. Restart Your PC: Sometimes a simple reboot can clear temporary glitches affecting the game.

2. Check for Game Updates: Open your game platform/store and make sure Dragon Mania Legends is fully up to date. Sometimes older versions cause loading problems.

3. Clear Cache and Data:
- Since you’re using a Windows device running the game via a browser (WebKit), clear your browser cache first.
- Close the game and open your browser settings.
- Find the “Clear browsing data” section and clear cached images and files, as well as cookies for the Dragon Mania Legends site.
- Restart the browser and try loading the game again.

4. Graphics Drivers Update: Although you’re on Windows 10, sometimes outdated or corrupted graphics drivers cause rendering issues like black screens with artifacts (rectangles).
- Go to Device Manager > Display adapters
- Right-click your graphics card and select "Update driver"
- Choose automatic update and follow prompts

5. Reinstall the Game or Repair the App: If your game installation is corrupted, reinstalling may help.
- Since you’re playing on WebKit, if it’s a progressive web app or client, try removing and reinstalling it.
- Alternatively, if you have the option to repair the app via Windows settings, try that.

6. Check for Conflicting Software: Some programs like antivirus or firewall settings can interfere with games. Try temporarily disabling your antivirus or adding Dragon Mania Legends to the exception list.

If you have tried any of these steps already, please let me know which ones so I can suggest more advanced troubleshooting. If none worked, we can also verify if there are any server issues!

Would you like me to help you go through these steps now?