I'm really guessing here. Drag and drop autoconforms a figure to whatever you drop it on if you drop it on a figure. If you have no figure under the mouse pointer, then it won't.

But, suppose you have one of those room props that's actually been set up as a figure, so the doors can open and close. If you drag a figure into the room, you're going to conform it to the room, no matter where you drop. Could that be the case? You're dropping on something you didn't realize is a figure?

And if it is a figure - who knows what will happen when the "bones" line up.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)