If the documenter extension is installed and the #drawer-documenter div is displayed in the main publish window, when a subsectionmanager field is opened up, the #drawer-documenter div is also opened inside. This prevents user access to the subsection field.
I added the following css to subsectionmanager.publish.css which seems to have solved the problem (though I would not presume to know the ins and outs of Subsection Manager):
If the documenter extension is installed and the #drawer-documenter div is displayed in the main publish window, when a subsectionmanager field is opened up, the #drawer-documenter div is also opened inside. This prevents user access to the subsection field.
I added the following css to subsectionmanager.publish.css which seems to have solved the problem (though I would not presume to know the ins and outs of Subsection Manager):