Samer I have the same issue. I hosted them on my server online for the ET version. I can go to ui.veuphoria.com and it works, but visiting the IP address of the OS, or using the app just returns, the black page. I was certain I had caused the issue so I didn’t mention it, but I don’t get errors at all. Just a blank black page.
The same result can be achieved on your version by opening the ui using the IP address, and then pressing the back button after logging in. It will go to the blank black page without going to whatever was in the browser history, and then no navigation buttons will work in the browser. I’m not a web developer so I was not able to fix the problem, and no errors are thrown so I don’t even know where to start.