I had the same issue of disapearing roads. The road had moved to a different spot on the map on loading the map. 64 bits version 7. I used a maximum sized map. Not using the itch app yet since I'm on a borrowed computer. My latest save/reload worked fine by the way, so there is a variable factor somewhere.
@Zekyl, there is tooling to move items around (top right). Just float it in the air at the correct height.