Now I am not Q and A but I have been looking into what caused the glitch that put the interior toys on the forefront of possible blame.
Awhile back there was the toy box that was glitched (MARVEL VILLAINS ARENA)...it had Luke Skywalker land speeder, you had access to a bunch of skydomes without needing the disc and also terrains. There was DEV arrows and a couple of toys not in the normal ribbon...
Not knowing- I used a stripped out version of this toy box as the base for the HUB and the 4 attached sub levels. SO that may be the reason why other toy boxes with Interior toy usage hasn't sparked any glitches for people.
So either that glitched toy box is the sole source or the combination of both this box and the interior trick. I imagine nobody else is using this box to create new boxes.
So just wanted to share that in case there is still some fear out there. I'm not saying go out and fill a brand new box with interior toys to the max but just saying that the base box was more than likely what doomed my Stark toy box.