Thanks for the feedback.
We have analyzed the DebugView you sent and able to reproduce the black screen issue on our side.
This issue was caused by the current screen resolution pitch limitation in the current Windows 10 (Microsoft Store) version, Android (Google Playstore) version and iOS (Apple App store) version.
This limitation will be removed soon.
But for now, you can use the Windows 7 (Desktop version) Viewer and it should work with your 5120×2880 client screen resolution.
Or you can still continue to use the Windows 10 version of the Viewer app and just make sure that the client resolution width will not exceed 4096.