I've created a simple railing in Corona using 8 materials (5 colors, 3 metals). This multi/sub material is applied to both the original segment objects and the RailClone object itself. I copied the material parameter node layout from one of the gutters as it provided the exact solution I was looking for - however when I render the railing in Corona, changing the Mat ID parameter only partly modifies the object. Only horizontal beams near posts will change according to the value change, the remainder of the RC object will stick with Mat ID 1. This issue still occurs with presets pre-loaded with RailClone - e.g. gutters.
Thank you for any help on this issue.