ome structural work done in this area before I owned the house. We think th ere had once been a wall between the living room and the kitchen that wall was removed, and if so it would have stood right about there.
Holy crap!
I couldn't view the picture until I got home, so I was just reading the res ponses about retaping, replacing corner bead, etc.
Then I get home and click the link to the pictures, fully expecting to see some minor drywall damage, a few hours of work, etc. But holy crap, that's not just a seam repair.
In the second picture you can see a horizontal crack that runs behind the c urtain. I'll bet dollars to donuts that if you pull the curtain back you'll that the crack s tarts at the top of the rough opening of the window.
There is definitely some structural issue going on. Something settled and m ay be continuing to settle.