Hi Guy`s ,
The "Backlight" issues that I am having come from the "edge-lit" array seeping past the first layer of the LCD panel { or last }.
If I turn "Local Dimming" to "Medium or High" it just about goes away , however when I turn the dimming to "Low or Off" , in a darken room it is most notable at the top and both right and left sides of the screen.
Of course that is bound to happen , there really isn`t anyway to :seal: an edge-lit display completely , and there is a work-around by just lowering the backlighting.
What bothers me is that there is NO CONTROL over the picture settings once your in "App-Mode" , the TV is preset , and I confirmed that with LG

.
There suggestion was change the setting before you use any of the apps , well I disconnected my Mac-Mini from my cable modem and hard wired it straight to the LM8600 and there was [ is ] no control over picture settings , in fact when I tried I got bounced back to my cable box

Also notable is the backlight bleed , it first appears when your in the dark apps , like trying the 3D apps , then goes away once content appears.
VUDO and Picasa and YouTube are ok with no leakage , so I guess the TV really does control the picture settings for the apps.
I tried some familiar YouTube videos that I have watched with my Mac-Mini , and they are way better with the MM than with the YT apps built into the TV.
Haven`t signed up for anything yet ( still within my return window , but time is running out

Still , I say again and not to sound like a broken record ( cracked CD for the younglings

) , but they should have included a detailed book , ( it would have to be beyond a typical owners manual ) explaining all of the settings in detail and how best to navigate them.
LG , you messed up , BIG time , by not including at least something to go by. IMO
O__well "Once more into the breach"
Later ,
G.