New Jira user has white screen with logo only header

Jeremy Brooks_nxtzj9

I added a new user to access our cloud instance of Jira and confluence today but when they log in they just get a white screen wiht an empty header.

They can access confluence ok.

i have given them access to 1 project and added they are member of the groups for jira user, confleunce user, plus the project groups.

Jeremy Brooks_nxtzj9

This has resolved itself over time strangely and I have no idea how! It was a matter of waiting about 4 hours roughly in my case.