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When viewing model in Navis the elbows are not visible, any thoughts?
I will take a leap here and assume you used NW to READ the CAD file. If so, try going into the CAD app and EXPORT to NW instead. The READER is flawed.
Either that, or the object enabler is not installed, or wrong version of object enabler is installed.
Check the Scene Statistics - it will tell you what is failing, and if OE's are missing.