My 6 year old house has what looks like rather large cracks coming off of the top of one window upstairs. The cracks come off at a 45 degree angle for several inches (one as much as 6 or so inches).

Then on the right side of the window, there is a horizontal line that I believe is where there is a seam where two pieces of drywall meet.

I have heard that such things are normal, and I have heard that they are serious.

ANY THOUGHTS?