The attached configuration files for Scriptd contains a simple example to forward nodeDown/nodeUp events as emails.
The exact same content works on latest Meridian 2016, but it doesn't work on 18.0.1 or develop.
Based on the logs, it seems like Scriptd doesn't react or something happens and prevents to execute the external scripts. The log doesn't provide any errors.
Note: I used Notifications/Actions for the component because there is no component for Scriptd.