I see that you are using several of my designs/tutorials to promote DSM so I am hoping that you will help me with this problem. Please view the Unlisted video (link below) in conjunction with this text.
The problem concerns the loading of a complex assembly (of a model locomotive) which seems to want to load an rsdoc file/3D part that does not exist in the loco assembly. When the part/file is ignored the assembly loads into DSM but the unloaded file is not displayed in the structure tree in italics so that it can be deleted. Thus enabling a tidied up assembly and a clean load.
I have tried both version 4 & 5 of DSM.
Thanks Jim Taylor