Hi! I see you're having trouble opening the tastytrade app on your Windows 10 device using WebKit. Let's work together to get this fixed.

First, could you tell me a bit more? For example:
- Are you seeing any error messages when you try to open the app?
- Does the app start to open and then closes, or does nothing happen at all?
- Have you tried restarting your computer or closing and reopening the app?
- Are you using any VPN or proxy that might affect the connection?

Meanwhile, here are some quick steps to try that often resolve app-opening issues:

1. Restart your device: Sometimes a fresh reboot can clear up temporary issues.

2. Close and reopen the app: Fully exit the app (check Task Manager to ensure it’s not running in the background) and then try opening again.

3. Check for app updates: Make sure you have the latest version of tastytrade installed.

4. Clear app cache: On desktop platforms, clearing cache can fix performance problems. (I can guide you through this if needed.)

5. Check your internet connection: A strong, stable connection is important. Avoid using VPN or proxy settings that might block the app.

6. Reinstall the app: If nothing else works, uninstall the app, then download and install the latest version from the official site.

Let me know what you’ve tried so far and any details you notice when attempting to open it. I’ll help you step-by-step!

Are you seeing any specific error messages or behaviors?