I just encountered this minor defect from browser of one specific machine.I can see the login screen of the GUI. but after logging in its just a blank page like this,Although this dint occur for rest of the physical devices
With self-signed certificates I sometimes notice that part of the page is cached and part not loaded because the certificate is invalid. The result: part of the page is rendered but because the browser is not noticing me about the self-signed certificate, the rest is not loading. This can be resolved (at least at my side) by refreshing the page.