Obviously we need to find out what the issue is the location lines are there and this would indicate some measure of visibility, would I be correct to assume these are Beams Systems and could it be that you copied the Beam System but not the Beams? In 3D are all the beams shown in a 3D View?
Also if they are Beam Systems do they have beam sections assigned in the Properties Palette?
To check if this is a Visibility Issue and quickly resolve this to get to a working state you could open the Working View
View Tab > Graphics Panel > View Template > Create Template from Current View > Apply to Non-working View

Jay Colcombe
Autodesk Certified Instructor
Revit Architecture & Structure Certified Professional
AutoCAD Certified Professional
B.Sc. Hons Civil & Structural Engineering
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