OK, if I understand the situation, the roof joists and ceiling joists typically run in one direction. (Yes with hip roofs you get these running 90 degrees at the outside walls.) The drywall is typically installed with the long side along the joists, and the short side ACROSS joists (I have seen the opposite). Therefore the side going ACROSS the joists is only attached every 2 feet. The home inspector I used mentioned that it is fairly common to have cracks develop in these homes. He was surprised that we did not have any, however one developed about a month later, just out of warranty....
I would not worry about this unless you see one of the pieces of drywall SAGGING in the area of the crack, this could point to incorrect attachment, too few nails.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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