I just started noticing a small area of distortion in my pictures. Does anyone know what is causing this?/QUOTE]
That was a glitch that turned up in a firmware update for the Advanced.
DJI fixed it about two days later with updated firmware V1.2.8
You can get the update here http://www.dji.com/product/phantom-3/download
Here's some discussion about it from back when it turned up.