I fussed with the object by commenting out various hotspot combinations and managed to break both the Side Length hotspots. Restarting AC and I’m back to square one (2 working, one failing).
One thing to note: when the error occurs the 3D origin is mistakenly oriented with Y in the Z direction. You can see this in James’ screen shot.
Geoff Briggs
DeForest Architects
Seattle, USA