Fractured Drywall in the Kitchen

I think it's pretty well documented in this here blog that I love the addition to the house, especially with its new and gracious kitchen space, in which I like to spend so much time. It is also well-documented that the months since the completion of the construction project have seen quite a few problems surface. Some of these are minor, of course. But some relate to significant issues in the construction with wide-ranging subsequent problems.

For instance, my general contractor discovered that a center support beam under the addition had dropped down, which did much to account for the many places that there are drywall separations in the corner joints of several rooms, and for the alignment (or mis-alignment) of some doors, and for the cracked grout and popped up tiles in bathrooms. (I don't think it accounts for the opened seams between hardwood flooring planks, which seems to surface in winter and disappear in warmer months...that problem is back again in these days of cold harsh January and February.)

Separation at corner joints of drywall is one thing, but it seems to be a different order or magnitude when you can see that the drywall is actually splitting and fracturing, as I noticed beside the kitchen door that leads into the back hallway. (There is also a seam opening in the wall on the hallway side of this door.) So is this further sign that there is settling and mis-alignment with the construction?

I should note that that door is back to not properly closing; the latch does not align with the wall plate anymore. My general contractor, Peter R. LaRoque of Mocksville, NC, has already done one repair on this door (as well as some others) but something continues to shift.