It is possible that your scene is using broken reference, references that 
have been deleted/renamed etc...

On Monday, October 17, 2016 at 5:17:27 PM UTC-7, Daniel wrote:
> Hi,
> I was wondering the _UNKNOWN_REFERENCE_NODE_ gets created. The node is 
> usually attached to other reference nodes and I could delete it or filter 
> it by using but I cannot reconstruct how 
> the node gets created. Same goes for the sharedReferenceNode.
> Any input on this is highly appreciated.
> Thanks,
> Daniel

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