Hi there! I see you're having an issue with the Lib app showing a black screen. I'd like to help you get this sorted out. Can you tell me a bit more about when the black screen appears? For example, does it show up as soon as you open the app, or after you try to open a book or perform a specific action? Have you tried anything so far to fix it?

Meanwhile, here's a common first step we can try:

1. Close the Lib app completely.
2. Restart your Windows device.
3. Open the Lib app again and see if the black screen still appears.

If that doesn't help, the next step would be to uninstall the Lib app from your Windows system, restart your device, and reinstall the latest version of the app. This can often resolve issues related to corrupted app files or updates.

Please let me know what happens after these steps or if you've already tried them!