Hmm, I'm sorry to hear that.

Does your friend have little tree tops coming up through the floor? I once targetted the floor with a bloodwood arcane circle, and the arcane circle vanished (I immediately assumed it went under the house).

So I paged a GM, and the GM said that indeed it had gone under the house (because of the tree) and recovered it and watched while I placed it correctly.

The GM also told me it was a good thing I'd paged, because it would have decayed if I had not.