Leather cuff owners would have gotten a blank HUD when they tried to update. Which would be quite pointless since that meant transferring the old gear – you would not be getting the new cuffs (v2.4.2) this way.
This has been fixed, and the v2.4.2 cuffs are now in the v5.7.1 HUD.
Either SL ate the cuffs or I missed a step to load the cuffs into the HUD. Either way, sorry.
It’s safe to update again!