Hi, I'm posting this here as I cannot post on the official forums about v5 as my license has expired, although I am considering purchasing/upgrading to v5 soon (currently on 3.8.x)
I just registered on the demo and after submitting the form a pop up box appears containing links that say you can edit your profile, check out the user control panel etc.
So I clicked each of those links to open them in a new tab. Each of the pages is just blank, the forum container is there and the notices at the top, but no content within the page.