If you experience a black screen after the EAC loading screen but before choosing a character, the following may be helpful.
This is especially true if you've played on a different environment, such as the PTS, and then return to the live build.
Navigate to: Users/$UserName/Appdata/LocalLow/Bossa Studios/Worlds Adrift
Delete this folder.
(Note: this may also be helpful as a generic troubleshooting step for the majority of black screen / loading problems.)