This is not really a question, maybe a bug report (is there a place to made them ?) at least a workaround for a problem I encountered.
I got problems while creating virtual buttons for a prototype I'm working on.
This problem occures in both create virtual button through ImageTarget -> advanced -> Add Virtual Button and create empty object then add component -> Virtual Button Behaviour.
In both situation my button is created with a Mesh Filter "VB Plane-xxxxx" (x for random numbers) and when I press Play nothing happend with the button.
If I use the virtual button from the sample scene it works perfectly. (the mesh filter name is "VB Plane")
So I try to copy/paste mesh filter from sample to my button (so with the "VB Plane" name) and ... it works !