Hmm I haven't checked other neighborhoods because I only ever play one. I should go look. I also don't use SimPE because I'm on a Mac. So I don't suppose I can go in there and fix it.

So would the conflict only occur when the offending object is placed on the lot? Or does just having it in my downloads folder cause it? I found I have one lot where the creatures haven't shown up yet.

Hmmm, you're probably right. I guess I wouldn't think of an object doing that kind of thing. I've had lots of issues with downloaded objects in the past though. Now to track down which one(s)....

I saw a screenshot of this phenomenon on one of the More FUBAR Than You threads, but no explanation as to why. I have these annoying dog/human creatures showing up on my lots. The only interaction they have is pranking people. If I don't keep a close eye on my sims they end up getting water balloons thrown at them. I can't get them off my lots. They never seem to leave even after all other guests have left. Eventually they leave, only to return some time later. They also mess with my gameplay. If a Sim is in the vicinity of one and has interacted, the Sim just stands there idling and I can't get it to do anything else until it chooses something autonomously. I took out all my hacks and it's still happening. Any ideas as to why?