Mary Cooch (personal account)

Your question is fine  I personally don't have a good answer. The only think I can think of is that years back in Moodle 1.9 I used to upload games which were basically a swf file, an html file and another file (some CSS probably) all linked together like yours. I uploaded exactly the same game into two Moodles of the same version and in the same way. In one Moodle the game displayed perfectly but in the other Moodle the paths just did not connect and I never found out why  All I could think of, and all I can think of now, is there is some difference in the way the files are hosted or displayed or with permissions on different servers.

Did it work for you before? My understanding is that only admins can have repository instances in the user context.  This is certainly the case for the File system repository If you have been able to do this before 2.7, please say; otherwise I will edit the documentation accordingly. Might this tracker report also be of help? MDL-34945

When you create your groups, add the teacher to the group as well and in your course settings, set it to either Visible or Separate groups.

For groups at a global level, see Cohorts 

What are your settings for each course? Do you have the paypal plugin as an enrolment method in each course and is self enrolment disabled?