I've been a long time user of SWA gadgets and Mistress orb. The orbs I've had out were all deleted, along with any new copy I try to rez. No one I've met know exactly what happened to make the builder quit SL, but it is known that there was a disagreement between her and LL. Here is my theory:
The builder / scripter SweetNWild Magic made a detector HUD and inworld object that could detect when a linden avatar was in sim, or near sim boarder. This device was called LSD (Linden Staff Detector). Apparently this device could detect Lindens even if they made efforts to cloak their presence from standard security orbs.
These detectors are still around, but without the builder updating their database of avatars, they are now pretty much useless. Far as I know, the security orbs by SweetNWild Magic did not have this advanced detection, but possibly they were still able to eject Lindens.. I can not confirm this, cause I never had a log of it happening with my orbs. For whatever reason, it is likely that LL now prevents them from being rezed in world. Perhaps someone from LL could enlghten us, because I had several of these orbs that were not the free version given away when SweetNWild Magic left, and several 1000 of my $L has now been wasted.