If I click on System I can then see categories and work my way to my course.
The legacy course file are from the LH menu remained correct in all courses.
No errors were reported during the upgrade I tried accessing from different browsers. I also tried the upgrade on two different servers.
I have restored the server back to 2.1.2 and all is working properly again i.e I can see the course files area from the file picker.
Any help appreciated.