To setup Edval for the new school year, you need to publish the new timetable structure for this year before the timetable will sync and display in Sentral. Sentral will show a warning within the Timetables module until you do this. This operation is handled entirely within Edval by completing the following steps: 

Open the appropriate ETZ file in Edval 

Go to File > Sync with system > Sync now 

Click on the Manual tab 

Ensure you tick the Publish Bell times option 

Click OK 

From now on, sync from Edval as you would normally.