When I use the server you can download from the site, there's always errors of missing graphics on most maps. I fixed it by copying the scenery-gfx folder from the soldat folder to the server folder. Maybe someone forgot to update it when more default graphics were added?

server folder goes in the soldat folder, does it not? or am i mistaken?

No it doesn't have to go in the soldat folder, I'm not even sure its supposed to. But yea, I noticed that too. It's a simple procedure of copying the sceneries from soldat 1.3 into the server.