Summary
After the Arcana Scheduler service is restarted (e.g., when the computer is rebooted), one or more scheduled programs have disappeared. When you look in the schedules\1 subdirectory under the Arcana Scheduler program directory, the ".cfg" file for the program in question has a size of 0.
Status
This problem was resolved in 2.3.2 of the Arcana Scheduler. Please see the download page to download the current version of the software.