(03-20-2014 03:28 PM)Hayati Osumi Wrote: It's a solid object at all times and never set to phantom...
And there's your mistake.
When the cat goes non-physical (phantom) it can move itself INSIDE your prims.
When it later goes physical (non-phantom) the prim it is INSIDE, becomes PHANTOM, but ONLY with respect to the cat, and the cat becomes phantom, but only with respect to the prim.
So, yes, your self-built house DOES become phantom.
And, if the prim the cat is inside is the floor, the cat will fall (since *IT*, the cat) sees no physical floor prim until AFTER it has fallen through and the temporary phantom settings are removed.