Black Screen In Warcraft III: Reforged

This can happen if you are playing Warcraft III: Reforged in fullscreen mode. To resolve this, please follow these steps :

1. Select Warcraft III on the Battle.net app
2. Next to the PLAY button, click Options and select Game Settings
3. Under the Warcraft III section check the box for "Additional command line arguments"
4. In the new box type in:  -windowmode windowed
5. Click Done