Does anyone know why a mounting boss cannot be mirrored across a plane? I tried it with a snap hook for a test and the snap hook mirrors just fine. SW2013 x64 SP2.0. I don't specifically remember doing this in past versions, so it may never have been able to. I've tried it with and without the rib, deleting the rib. Even deleted the boss and recreated a few times, still no luck. I'm stumped.