When you go to Site administration > Appearance > Sort My courses you have the option to sort your courses.

As a site admin I expect when I change this setting the courses in My Course / Courseoverview block will be sorted in the order I have set. 

I believe this is a setting that works for the 'navigation block' that will not be used in Boost or Boost related themes for obvious reasons. 

but the description of this setting is NOT clear in that case that it related to the navigation block. 

This said I think it would be really nice if this setting would control the sorting order of the courses on My Courses page and/or the Course Overview block