When RailClone is installed in render nodes, the texture path is added automatically the first time a scene is rendered.
We have detected this feature doesn't work well if RailClone was used previously with a different Max version in the same machine. For example, if you had Max 2012 and then upgrade to Max 2013.
To avoid this problem, run the attached registry key before installing the software in the nodes. The issue will be fixed in the next plugin update.