Hey @J_Busch
Thank you for using Codebook and posting to the discussion forum, although I’m sorry to hear about the trouble with Secret Agent not inserting values. This sounds like it might be an issue where you need to re-grant your Automation and Accessibility System Privacy settings for Codebook. You can find those settings under: Apple Menu > System Preferences > Security & Privacy > Privacy Tab.
There are screenshots and further instructions here: Troubleshooting Codebook Secret Agent
Let me know if that allows you to insert using Secret Agent again. Thanks!