We are currently investigating an issue with the Turnitin integration with the Blackboard Grade Centre.
If an instructor edits the Turnitin post date while the associated column in the Blackboard Grade Centre is hidden to students, it causes the relevant column to become visible to students allowing them to see their marks and feedback.
While we test a fix to this problem, when adding a Turnitin point please set the post date to a suitable future date and do not edit this until you are happy for marks and feedback to be released. If you do need to make any changes to the post date please ensure that you check the corresponding Grade Centre column to ensure your settings have been maintained.
If you have any questions please do not hesitate to contact us.