I have upgraded from Moodle 3.7 to Moodle 3.8+ (Build: 20191212). We are running the Classic theme. When a teacher or administrator turns editing on in a course, the header menu items no longer drop down and the edit links beside each activity or resource do not drop down but take the user to the top of the page. On turning editing off the header menu functions again. This occurs when using Chrome and Firefox but Microsoft's Edge and Internet Explorer are working. I have tried Boost and Clean themes and clearing the cache. We are running on a Windows server with:
mysql 5.6.22
php 7.2.7
Any and all help appreciated 😃