(This only affects H4 sims)
It appears now that if you pick up an unlinked group set (selecting several unlinked items and then grab them all at once into your inventory) and rerez it, the last item in the group set gets its name changed to the first. I noticed this today when several customers claimed one of the door sensors in a door I sell was not working. The sensors were named "smart door sensor" and the door was named "smart door v2.0". But when customers rezzed the set one of the sensors got its name changed to "smart door v2.0" and so the door was not listening to it anymore. This new bug will break many many items that are packaged or picked up as unlinked group sets. I tried it on a few other unlinked groups and the problem also occurred with those. To solve the problem for now I added code to the sensors than changes their names. This is a very huge bug. I suppose I will plunge into the unwieldy bug reporting system. I'm fairly sure this is a new bug as I've sold thousands of these doors for two years with no problems until today.