Hey Hey,
I've been having this issue with truss since I upgraded to 2021, I've just updated to SP1 and I'm still having the same problem.
The issue is fairly random, sometimes truss is visible in 3D, sometimes I just get internal bracing, sometimes just the main chords, sometimes I see nothing at all.
I can copy and paste everything to a new file, sometimes It will show, sometimes it will make no difference.
Truss objects (at least for me) are saying the have no Edit behavior, so I cannot apply the texture fix mentioned above.
I'm tearing my hair out. It has to be something simple if not everyone is having the same issue.
Please help!
Roy