Hi there! I understand that you're seeing a white screen after clicking "Log In" on your Windows 11 PC while the same login works fine on your Windows 10 machine. I'd like to help get this sorted out.

To get us started, could you tell me if this issue is happening only with the UPS app or also with other apps or websites on your Windows 11 PC? Also, have you tried any fixes so far, such as restarting your computer or updating the app?

Meanwhile, a common cause of white screen issues after login on Windows 11 can be related to graphics drivers or app compatibility. Let me guide you through some steps to troubleshoot this:

1. Restart the UPS app and your PC: Sometimes a simple restart clears temporary glitches.

2. Update Graphics Drivers:
- Press Windows key + X and choose Device Manager.
- Expand the "Display adapters" section.
- Right-click your graphics driver and select "Update driver."
- Choose "Search automatically for updated driver software" and follow prompts.

3. Run the UPS app in Compatibility Mode:
- Right-click the UPS app shortcut or executable.
- Select Properties > Compatibility tab.
- Check “Run this program in compatibility mode for” and pick Windows 10.
- Click Apply and OK, then try logging in again.

4. Clear UPS app cache or reinstall:
If the app has a cache folder, clearing it may help. Or uninstall and reinstall the UPS app to ensure you have the latest version.

5. Check Windows updates:
- Press Windows key + I to open Settings.
- Go to Update & Security > Windows Update and check for updates.

If none of these steps help, we can try more advanced steps like checking event viewer logs or safe mode.

Let me know what you’ve tried or if you want help with any of the above. We’ll get you logged in smoothly on your Windows 11 PC! Are you ready to proceed with these steps?