DXF scale not preserved in EDrawings

I just opened a dxf in Edrawings to measuse something. Scale was 1:5. When I used the measure tool

the data given was the scaled down size. eg 100mm insteal of 500mm at 1:5 scale.

Works ok in dwg editor and when imported into solid works.

Is this a bug?

Using SW 2010 sp4

SolidworksEdrawings