Creating Diagram page loading endlessly

Hi,

I’m trying to use Diagram App to create a new Diagram page but whenever I select the type of page to be Diagram and click next, it starts loading and will never finish. I’ve searched for the issue but found only a few other examples of this problem and none of the suggested solutions helped in my case. Does anyone have any suggestions on what to do next?

Really? Nobody’s faced this issue before?

Did you check the JavaScript console from the browser’s developer tools? It may show some JavaScript error messages that could help investigate the problem.