When opening up a KS9 file that has material type Translucent, it becomes "Translucent (Advanced) (Legacy)", a temporary substitute that you cannot re-select later.
It also causes a speckled cloudy appearance to the translucency, If you pick the normal "Translucent" material type in KS10 it returns to normal - EXCEPT nodes attached to specular and surface in the material graph, become disconnected, to restore the appearance, you need to reconnect them.
Luxion: please fix this.
Image 1: original red translucent plastic appearance in KS9
Image 2: this is what KS10 does with the material upon opening the file
Image 3: Selecting the normal Translucent material - disconnects nodes to specular
Image 4: Reconnecting the nodes manually restores the appearance.