I have a website running WB 2.12.2 r379 and php 7.3. I have just logged in as admin to make some changes. The log-in screen did not appear as I was expecting but works fine to log-in. I clicked through to the page I wanted but there was no editing text box displayed. There was a brief flash of a text box with no editing toolbar then nothing. None of the screens looked like they have previously, i could access all the sections from the main toolbar except that the Admin-Tools link was far smaller than previously.
Thinking about it, my conclusion is that it is a css problem as none of the screens look like they used to. Either the css file has been modified or is not being loaded. How can I check this? Where do I find the css file?
I have another site using exactly the same software versions on the same host and that is working fine.
Any suggestions welcome.