im using trainz 2019, i also the same problem on t:ane. imade basic route with 2 blocks of ground basic hills and track and buildings with out texture and roads with cars. i saved it and it was fine, but when i wanted to ad texture streets and road and i save it, 1 block of mass went away and all the textures went away and the tracks and road go of the block because 1 went missing. how do i fix this and why dose it do this?
here is a image