[Inkscape-user] Can't ungroup Conditional Group

Hi,

I'm attempting to ungroup this object http://upload.wikimedia.org/wikipedia/commons/c/c3/Two-stroke_engine_moving_...

When I try to do so in Inkscape it identifies the object as having a Conditional Group of 1 Object but then says there are No Groups in the selection when I try to ungroup it.

Is this a problem with the file or Inkscape?

I'm using Inkscape 0.48+devel+13132+47~ubuntu13.10.1

Antonio