I'm selling my house and have this crack in one of the downstairs rooms. It's only in one of the rooms and is pretty much a straight line. At it's worse point, it has dropped about half of an inch as seen in pick 2.
The house is 13 years old and the crack appeared about 10 years without any drop and got worse about 4 years ago (no event, just noticed it one day).
Thanks
J.