We've had confirmed reports of issues with Delta Control plug-ins and Logic 10.4.5 when writing automation from the console fader.
Consoles will follow previously written automation, and automation can be written by using the controls in the plug-in GUI, but making changes from the console surface does not write automation.
This affects Matrix consoles, Sigma Delta, AWS and Duality.
We advise customers not to upgrade to Logic 10.4.5 to maintain normal operation of Delta Control.
UPDATE July 2019: This issue is also present in Logic 10.4.6.
UPDATE August 2019: This has been confirmed by Apple to be an issue with these versions of Logic.
UPDATE November 2019: This issue is also present in Logic 10.4.7.
UPDATE January 2020: [SOLVED] This issue is no longer present in Logic 10.4.8.