Hi Robert, You could try exporting the model to DWG and then loading that to Tekla BIMsight. DWG format is not that good in Tekla BIMsight as IFC, but I found out that others have had same "black" problem with other software also. And then they managed to fix it by using DWG format. We have improvements coming to DWG support in the future. Hope this helps. Best regards, Marko Myllymaa