I don't know if it has anything to do with work they might be doing to the HD studio but,
I'm noticing tonight and at times this week for some shows the graphics on the green screen are not fully keyed in.
In this still from the 10pm hour, which I believe is the green screen in the HD studio,
you can see the map is not keyed in 100% and darker since you can see through it.
Notice the seam where the floor and wall meet going through the bottom of the screen and the scuff marks on the floor.
There is also a soft edge around the OCMs.
Not sure if this is the other green screen by the DMC but Earlier in the 7pm show the map is keyed in 100% and you can't see the floor or wall.
Here is a side by side of the bad key and the good key. Are they using two different green screens areas?