Hi, I faced same issue.
My add new quiz page only disappears. http://files.gurumug.com/656FuUT
and this happens as my main user role controlling plugin is my LMS plugin – Goodlayers LMS. Is there a solution for it?
I am facing same issue. What you did ? Or asked the host?
I am having same problem 🙁 was testing things don’t know if some plugin did this or else. Uninstalled recently added plugins too to have this issue resolved. 🙁
Plz help out