Lux Mix renders grey

[patro1]

Lux mix material doesn't seam to work properly. Whatever I try, whatever map i use, the result is always grey
testing the 2 materials separately show that they work properly.
Maybe it is part of the problem: Lux mix will show always the same name and material type for the 2 sub mat slots.
But when you click on the slots, inside there are the right materials.
For exmple: Lux mix made from slot 1 Lux glass material, slot 2 Lux glossy 2. but the visualized name on the 2 slots will be always the one which make the Lux glossy 2 material

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