Just updated to 4.0 and now nothing appears but a black screen. Tried in Chrome, Firefox and Opera and all the same. I cant see the home page or even log in to attempt to change anything.
This is my url: https://spaldinghighschool.co.uk
Its just a black page.
Im assuming that its probably the theme thats causing the issue but everything was up to date before the install was done and no theme was highlighted during the install as an issue. I went from 3.11.6 to 4.0