HI, we were able to reproduce the issue: elements, downloaded from SketchUp 3D Warehouse, then converted to Morphs and saved as GDL objects, won’t be visible in the 3D view of ARCHICAD 19.
The reason behind this phenomenon is that new commands were placed in the script of the above elements. These new commands are not recognized by older ARCHICAD versions, because saving an archive plan doesn’t change the scripts.
A possible workaround can be Save As… in GDL format, then create a new object in ARCHICAD 19.
Another possibility is creating the element directly in the older ARCHICAD version and save it as linked library (not to the embedded).
best, k