I'm currently sculpting some roof tiles and their all separate objects I've imported from Maya into Mudbox. Some of the roof tiles are being unaffected by my sculpting, none of the tools work on them. All the other tiles are sculpting fine, no problem. The objects that are not sculpting are not locked, I've tried re importing from Maya, I've tried opening a new scene, I've shut down and restarted Mudbox, I've tried importing as an obj, I've played around with the brush size and strength, I have also tried my mouse and tablet and still nothing. I even tried changing the materials in Mudbox with no effect. I'm using Mudbox 2016.