No, I think I have been very lucky in that aspect. I was in a tree stand in spring and was watching a squirrel eating some oats by the barrel. A black bear came in and chased it around and it ran up a tree. The same tree my camera was mounted on. What's neat is the bear climbed the tree a bit and was resting its back paw on top of the camera. It still has the claw marks on it.
Also have photo's of them licking the camera I'll try to put one here.
I placed a camera a while ago in a great location where I was getting big hits from a black bear. I just couldn't get him on camera. He would find it and knock it to the side. It didn't matter where I hid it, the same thing would happen. I began to think someone was playing with my site but the scat signs were fresh. I stuck up another camera and both would be knocked to the side.