After install of Service Pack 1 using the command convert3dmodel will crash Autocad.
The problem seems to be with the CadMEP Object Enabler File *.dbx
Temp fix if you need to use the command would be backup or re-name the installed dbx file and than over write with original 2016 dbx file.
I don't believe you can do today's job with yesterday's methods and be in business tomorrow.
