Dwg/dxf files are not visualized


I’ve got a .dwg/.dxf file from a client and I tried to open/import it in Rhino. The file loaded, but there is no visualizing. It is a floor plan. Several levels are shown but even coloring them does not help. Also Rhino alarms me, that there are invalid surfaces. Any suggestions?

Hello - what is the full output on the command line when done? - F2 will show you the command history.