QGIS 2.18.1 - I've used data-defined labelling (X,Y,Rotation fields) with earlier versions of QGIS. I can move and rotate labels OK with 2.18.1 but cannot change the label text. When I click on the 'Change label' button and select a label on the canvas, the Layer properties screen comes up, but all the fields are greyed out and hence uneditable.
Has anyone else had this problem?
Layer Labelling Options
from the toolbar or the left-most icon at the top of the Layers Panel.