Modifying and releasing a drill will affect the test that is defined by the drill. After releasing, the test is marked as 'outdated'. This means that the test still contains the previous version of the drill. 
 

By updating the test to the latest drill version the most recent changes will be presented to the participants when they take the test. Note that too many changes will present a different test compared to previous versions.

Updating the test

Via the option 'Manage drill versions...' you can update the tests per drill. For each drill, you can now indicate if you want to update the drill version.

 You can also update the several tests linked to the drill by opening the drill in the left pop-up window. Here you can update all the tests or selected tests linked to the drill.