Test :
DM800se - openpli original image - everything OK
DM525 - your image - distorted picture
D520 - your image - distorted picture
DM520 mini - your image - distorted picture
test on 4 original box -
Astra 19, Hotbird 13, Eutelsat 16 - without picture distortion on all receivers
BBC One HD distorted picture - switch to another TV channel with a different frequency and immediately return to BBC One -
Picture on BBC One is fine again (DM520,DM525,DM520Mini)
It doesn't happen every time - sometimes everything is fine with no picture distortion