I-Model Materials Beams and Columns

I'm having trouble with publishing an i-model.

Whenever I do the beams and columns appear not to carry through their material apperance. Attached are screen shots showing what I see in AECOsim .dgn and Navigator i.dgn. Note the bright green concrete beams and columns (which is their bylevel colour) and the blue steel beams in the foreground (also their bylevel colour).

 The i-model seems to show the correct family/part but for some reason the material does not show and appears to be replaced with the bylevel colour.

We have made some changes to the concrete beams/columns catalog and part definition but have certainly not touched the steel - so I don't believe it is a configuration issue that we have introduced into our workspace. The problem occurs with members directly placed within SS4 and members upgraded from SS3.

As far as I can tell all other elements are coming through with the correct materials - brick/block walls, windows, solids generally...

I've tried compressing the file before publishing, but that made no difference. There don't appear to be any other settings in the i-model publisher which I can change. I'd be grateful for any advice on how we can fix this issue - we need the i-model to match the AECosim model.

Mark

ABD SS4 v08.11.09.627 ANZ Dataset