Auto-generated student Dashboard links all broken - missing slash

Hi there, when I'm logged in as a Student, I have several links to click on in the Dashboard.

This is what the link LOOKS like (notice the ending):
http://my-art-related-website.comm/members/courses/course-nameworkbook/

(ps -- this is a FAKE LINK at the start -- I just wanted to show what it LOOKS LIKE)

This is what it SHOULD look like, with a SLASH before the word "workbook":
http://my-art-related-website.comm/members/courses/course-name/workbook/

This is the same for :
- units
- notifications
- discussion and
- workbook.

I've checked the site on both Firefox and Chrome on Mac, same result. Broken links.

>>> Is there a setting somewhere which needs a "trailing slash"?

I am spending so much time trying to get this site working, it's definitely not as simple as the sales page and instructions made it seem.

Many thanks in advance!