Blank Screen when logging into Ex2Ultra with iPad

I have an new EX2Ultra on a wired home network. I can login as admin using my desktop and either Firefox or Edge.
If I login wirelessly via my iPad I just get a blank screen with a logo but no menu items. I’ve tried using Safari and Firefox but neither makes any difference.
If I go back to my desktop I cannot login because the session is in use?
Any ideas
Thank you in advance