Getting even weirder. Depending on the angle of a piece of truss, VW wil either show it or hide it. Default position: shows up. Roll it over 90*, it's gone. Turn it back 90*, shows up again. Viewing angles don't matter. Position does.
Tried to edit the symbol of a circle truss piece, to see if there's something wrong in there. Exit symbol, circle truss pieces suddenly show up.
Tried to recreate that with other truss symbols, nothing happens.
Copied all truss to a new file, everything is visible. Copied it back to the original file, everything keeps being visible. Add a new part of truss, invisible.
Shoot me please...