Yes, he's neutered, he has a big box, and he squats normally most of the time. In fact I've figured out that he only does this once early in the morning. He doesn't do this always from inside the box, either--just around it. I'll have to try the covered box, it might reduce the problem.

I caught him in the act this morning--told him no, pushed his tail down, and then cleaned up the mess. Maybe that will help.

You should see him right now... kittyboy's being so sweet to let mommy pet his furry yellow tummy