I'm working with Corona and since i upgraded to the Beta, the railclone objects i create via the presets come without any material applied.
I posted in the worng forum before and had this answer :
"Regarding RailClone, actually the library doesn't include materials for Corona Renderer, but we're working on that. They will be available in a next update."
I'm very surprised because it worked pretty fine before Beta, maybe I did something wrong but since the day I did the update I just don'get any material applied on the objects.
The only trick I just found is to create the object in another file with another renderer assigned, then convert materials to Corona, then import the object to my working file,
whixh works, but is a little painful !
(PS: can't revert to non Beta version, the railclone objects just don't seem to work anymore)