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I have a problem with qgis 2.8.1 (Wien). Whenever I change the project SRC to WGS84-World Mercator (EPSG 3395), the area is calculated as zero.

How can I solve this problem? Is this a known bug?

The answer from How can I get my Qgis area calculations in metres rather than degrees? My shapefiles are projected using WGS 1984 UTM fuseau 35 Sud don't solve the problem, since the problem only appears with a metric CRS.

Printscreen of error

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    Probably related: gis.stackexchange.com/questions/30006/… I feel that the layer may still have coordinate values in decimal degrees even though the CRS is 3395.
    – mkennedy
    May 8 '15 at 22:19
  • No. Even if I create a new shapefile, in a new project, both in EPSG 3395, the area calculated is 0 m². The perimeter calculated seems to be correct, just the area is zero.
    – ebarbara
    May 11 '15 at 13:05
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The $area works well. The problem seems restricted to the identify tool. Gonna report this as a QGIS bug.

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