This problem has now been resolved.
We are currently investigating a problem where the MyStudy tab list units in the MyUnits and Services table, but has no Blackboard / Sakai icon in the UNEOnline column (or has the column missing altogether).
This is not a problem with your enrolment, but an issue with the script that populates the table.
As a temporary workaround, please use the direct links below to access your units:
Blackboard: http://olt.une.edu.au
Sakai: http://sakai.une.edu.au
We are hoping to have this problem resolved soon.