QGIS label calculation always renders zero

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QGIS 2.8.3/Windows.
I'm trying to use the area of a paddock as its label. The layer is a shape file containing a single polygon.
In Layer Properties/Labels/Label this layer with I define an expression:
concat(tostring(round($area/10000,2)),'Ha')
The preview correctly yields 4.67Ha but canvas renders 0Ha.



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