by Lindy Klein.
Hi Peter,
Its good that you've got the course creator role working the way you want it, but I'm a little worried you may have given it more oomph than you really need, which can cause issues down the track. Given that the Teacher role is meant to be a course editing role, you may want to check the permissions on it, and make sure that those experiencing the issue did create the courses they are having trouble editing.
I hope this helps!
All the best,
Lindy