Maybe this comment will attract some attention.....
These activities that are not appearing are courses developed in Captivate, but not SCORM. I zipped up the html courses individually and added them to an activity. Unzipped the zips in moodle and made the index.html file the "main file". The activities, as mentioned, only appear for the admin.
When I published one of the same courses from captivate as a SCORM, and added it to the same course, the students see the one scorm activity.
Not sure if I broke any moodle rules, but I am sooooo curious why only the admin sees these non-scorm activities.
Anyone?