I was playing in a massively furnished version of the Sears Elmhurst kit home this morning. In one of the back rooms on the first floor was one of the motion sensor gaming mats. It was placed in its own little nook, with cabinets flanking either side and focusing posters on the wall. The rear edge was flush with the wall.

With the rig in the nook, none of my sims could access the rig. They'd just do that helpless "can't do it" arm wave. Pull the rig out of the nook, and it works as intended.

I've had other gaming rigs placed against the wall that worked with no trouble. Why does it have a problem with cabinets up against the rear corners?