Any chance you can share the DWG file with us?

But first try this tip from @maxim_k 

Try to set system variable USEQUARTZFONT=0:

http://help.autodesk.com/view/ACDMAC/2016/ENU/?guid=GUID-673F3876-0F2F-49CE-86D6-46F90013B23D

or try to use different TTF (OTF) font for the Text Style.