Hi there! I understand you're experiencing a white screen and cannot log in to the Second Texting Number app on your Windows device using WebKit. Let's work together to get this sorted out.

To start, could you please tell me:
- Did this issue begin recently after any update or change?
- Have you tried to log in before on this device successfully?
- Are you using the web version in a browser, or is it a desktop app?

Meanwhile, I can suggest some basic steps to try fixing this:

1. Clear Browser Cache and Cookies:
Since you're on Windows and using a WebKit browser, clearing cached data can resolve loading issues. Here’s how:
- Open your browser settings.
- Find “Privacy & Security” or similar.
- Select “Clear browsing data,” choosing to remove cached images and cookies.
- Restart the browser and try logging in again.

2. Disable Browser Extensions Temporarily:
Sometimes extensions interfere with loading. Try disabling them and see if the login page works properly.

3. Check Internet Connection:
Ensure you have stable connectivity, possibly restart your router.

4. Try a Different Browser:
Although you’re on WebKit, sometimes switching browsers such as Chrome or Firefox (if available) can help isolate if it’s browser-related.

If these don’t help, the issue might be related to app or server-side glitches. In that case:

5. Force Reload the Page:
Press Ctrl + F5 to force-refresh without cache.

6. Check for Service Status or Updates:
Sometimes the app’s server may have temporary issues causing white screens.

If the problem persists, please let me know if you can access your account on a different device or platform, or if you see any error messages besides the white screen. That will help me guide you further.

Are you satisfied with these initial troubleshooting steps?