llRezObject() only works when owner is online?

I'm having a BIZARRE problem with llRezObject.

I have a skeeball game that rezzes a ball at a certain position with a certain velocity. Works great! But I keep getting IMs from people saying it doesn't work for them at all. It's worked fine in the past and I don't get why it'd suddenly NOT work... especially since every time I test it, it works fine...

I managed to isolate the problem. It's me.

When I'm online, the machine works. When not, when fed the SAME launch parameters by a friend that worked fine for that friend when I was online, it fails to rez the skeeball.

Is this some insane new bug in SL, or am I not getting something? The game has had no problems until a few weeks ago... help!

Cancel the alert. I found out the problem. It's very obscure, though.

The lot I had the game in was recently set so Group cannot Create Objects. I did this because I'm the estate manager and I didn't want anyone in our group-deed renter's group to be able to litter in the arcade. But that ALSO meant the machines couldn't rez balls. Why the heck they COULD rez when I was online is a complete mystery.

This is the sort of thing that needs to be in the woefully useless SL wiki.