Solution

Follow these steps to reload the scheduling configuration and restore scheduled scanning:
Open Terminal on the affected Mac OS X machine.
Stop the Snow Inventory Agent job with:

sudo launchctl stop com.snowsoftware.Inventory

Start the Snow Inventory Agent job again with:
Shell

sudo launchctl start com.snowsoftware.Inventory

To solve this permanently for additional machines, create a new Mac OS deployment package that ensures correct scheduling settings. Scheduling of the agent is controlled entirely by the operating system.

Outcome:
 Scheduled scanning resumes on the affected device. Correct packaging ensures scheduling works across multiple devices.