UPDATE - Grendel's Children got there sim rollbacked! \o/ Also, news is a number of others got hit too.
NOTE - Some comments over at the SLU forums have
variously speculated that this is something being triggered by rezzing
an object that overflows the SIM owners own objects causing them to be
That should not happen since OWNER objects are the last to be
returned. ANYONE objects should be returned first, then GROUP then
Others have speculated that this is being caused by someone
rezzing an object outside on a next door sim then pushing it onto the
sim being griefed. Since my friend's sim who got griefed is not
mainlaind, is set to "no build" and there is no next door sim, this
should not be possible either.
I think Desmond Chang (as he posted in SLU) is right. This is far more serious.