It only shows a black/blank window after you open the Chrome browser on the remote computer during a remote session.
Please first make sure you're running Splashtop Streamer v18.104.22.168 or later.
- Open the streamer UI
- Go to the Advanced tab, scroll down to find the Install Mirror Driver button
- Click the button to install
There are two limitations when using Mirror driver. Please click into the link for more details.