It sounds like the issue might be related to how the preset is referencing the slide files. If the preset is looking for the slides in a specific path, any change in folder location, file name, or even network availability can cause it to fail. A few things to try:

1. Make sure each PowerPoint slide file has a consistent name and isn’t moved after saving the preset.
2. Check if the preset allows you to re-link or browse to the correct folder for each week’s slide.
3. Try saving the slides in a simpler path (e.g., C:\ChurchCalSunday) to avoid issues with My Documents paths, which can vary depending on user or OneDrive syncing.
4. Test one preset at a time to ensure it works before prepping multiple weeks in advance.