When following the next steps the name of a node is not changed/updated on the canvas:
1. Add for instance a UserTask
2. Rename the UserTask to 'Task 1' by using the properties editor and do not leave this field
3. Save the diagram (by using CTRL+S or by pressing save button)
3. The name of the user task as represented by the canvas will not change.
4. Verify the name of the UserTask by opening its properties --> it is named Task 1