Zbrush help

Chicken Dip

Hey guys, I am trying out some tileable textures in Zbrush and have come to a small hick-up. As you can see there is a brick missing from the top right corner. My problem starts there, I had everything layed out but i then started doing a render to see if it would be way to far out and unfortunately it was. I removed it with the EraserBrush, but when i try to add a new brick it will put it behind the layer of bricks even if i make a new layer ontop of layer 3. I am lost, any help?
http://imgur.com/s3eiYu0

Chicken Dip

Never mind, a simple closing the program and re opening it worked.