My sims keep saying there's something in the way?

I am having this problem. A lot. And not just with one sim... My horses too. There is nothing around them at all and they keep saying they can't move but they don't say what is in the way. Once I move them with moveobjects on they move... but before that they just stand there. Is there any fix? I know for a fact that nothing was blocking them. oh yea, and thye like the just float through the floors too.