If a model is processing (in Docs) that model will not be viewable in Navisworks. If you go in to re-append that model it shows that it is not selected to be viewable, but selecting and appending it does not bring it in. This has cause several meetings to be postponed/canceled due to the models being inaccessible in Navisworks. It would be a huge benefit to have the previous model version viewable while the newest model version publishes. This feature was added to ACCs web viewer and it would greatly improve our coordination workflow if it was in Navisworks as well!