The Original 2016 installed DBX, will not work for everyone. I was told by the developer that he has programmers in his office also crashing. I was also told it is a bug in the ACAD.exe causing it and it affects other softwares as well. So FabMep is not the only one affected.

If the fix will not work for you Install FabMep 2015 and Appload the arx in Autocad 2016 to make your Models.

I have been setting Navis back 1 Version since before it was called Navis (Jetstream)