Hi,
There was a bug in the new Police Legirons that would make their vertical chains go all gray without being able to fix it, after resetting or changing materials on the legs' PoliceTex plugin.
This bug slipped past my testing because it occurs to everybody but me (I did test the cuffs with my alt, but not this part apparently), and this is because of a silly permission issue.
The good news is that there is a fix for it, the bad news is that you need to get your legirons replaced to get the fix. When you request an update from any of the RR updaters, please make sure to choose the "REPLACE" option, not the other one or your legirons won't be fixed (this is because the culprit is in one of the child prims of the cuffs, the left ankle one specifically, and the updater does not touch child prim inventories).
Please note that although the bug is also in the Police arms cuffs and even in the Police collar, in practice you won't ever see it happen on these two parts because those do not feature rigged chains in 2D. This bug happens specifically on the 2D vertical chain of the legirons and nowhere else.
You can get the updated pair of legirons from any of the updaters found at these locations :
My Little Shop
Chorazin's store
Roper's Dark Playground
Dark Wishes
Sorry for the inconvenience,
Marine