I leave it on and only have one resolution set for 1080i. This makes all shows go to 1080i. With native resolution on and you select all the other resolutions that your tv supports like 480i,480p,720p,1080i, you get flashes as the receiver will change to what that channel is presented in. So Sd channels will go to 480i or 480p and hd will go to 720p or 1080i. This causes delays in the picture as the receiver changes to the proper resolution.