With the new Orchestrated 4.3 Scheduler, you might have added a note and even though your setting are set to show opened and close notes, they don't appear on the scheduler.
The reason is the Process Type must be set on the note before it will show up.
Step by Step Guide
To do so, follow these steps.
- Go to Production->Scheduler Notes
- Find your existing note (or add a new one).
- In the lower right hand corner set the Process Type field to "None"
You should now see that note on the scheduler.