VRayMtl parameter resets when rendering

Hi all,
I have a very weird thing happening :
On one of my VRayMaterial, the Refraction Glossiness paramters reverts to 1.0 after each render.
I set it back to 0.85 for example, render is ok with the glossiness and when render is done, i go back to the material editor to see the value back to 1.0 !
Anyone had this weird behaviour before ? any idea ?
By the way it’s a Polycarbonate material i downloaded on vraymaterials.de
Thanks !

Are you using SolidRocks by any chance? I also have had this problem when using the ‘Interp. Gloss in IrrMap (if <=0.8)’ function…

Hey you’re right, it’s a solidrocks issue :
http://solidrocks.subburb.com/index.php?option=com_kunena&func=view&catid=8&id=2809&Itemid=114
Thanks,