I was having trouble deleting courses from a totara site. I would delete the course and then get blank screen saying it was deleting but then nothing would happen and when I  would click away the course that I tried to delete would still be there.

These instructions are for helping with this:

Seems there is a problem with the "reminderlib" library. You can get such feedback/messages by enabling the debug mode. This link shows you how "https://help.totaralearning.com/display/TL110/Debugging"

This is what i did to be able to delete the courses:

1- move the folder "/var/www/totara/local/reminders" elsewhere, for example /home/ubuntu
2- delete the courses
3- move back the folder "/var/www/totara/local/reminders"
4- disable debugging mode