Hi! I understand your Gambino app shows a blank screen after re-downloading it on your Windows 10 device with WebKit browser. Let's work together to get that sorted out.

To start, can you tell me if you opened the app directly from your installed programs or through your browser? Also, did you try closing the app fully and reopening it after the fresh download?

In the meantime, here are some steps you can follow to troubleshoot the blank screen issue:

1. Run as Administrator: Sometimes the app may require elevated permissions to run properly. Right-click the Gambino app shortcut or executable and choose "Run as administrator."

2. Clear App Cache/Data: If the app has stored data that got corrupted, it can cause issues. Since it's on Windows, you can try clearing temporary files related to the app by searching for %temp% in the Run dialog and deleting unnecessary files, or if the app settings allow, clear its cache from within the app.

3. Restart Your Computer: A fresh reboot can clear temporary glitches affecting the app.

4. Disable Hardware Acceleration (if applicable): If the app supports hardware acceleration (using your GPU to render graphics), try disabling it by checking the app or your browser settings.

5. Update Graphics Drivers: Outdated drivers can cause display issues. Check the device manager and update your graphics drivers from the manufacturer's site.

6. Check for Conflicting Programs or Antivirus: Sometimes security software blocks apps from running fully. Try temporarily disabling antivirus or firewall to rule this out.

7. Try Reinstalling the App Again: Occasionally, reinstalling with the latest version helps.

If you have already tried some of these or if the problem persists after trying, please let me know which steps you've done so I can assist with more advanced solutions.

Are you comfortable trying these out? Let me know, and I’m here for any questions along the way.