I bought my home about a year ago (September 2011). It's a split-level ranch built in the mid-70s.
I have a couple of spots, especially on a wall going perpindicular through the center of the house (basically from the front door to the back of the house) that has a lot of drywall nails starting to pop out. I also have some taping in the corners near this wall that is visibly wrinkling up.
In line with this wall, there is a section of what looks like two pieces of drywall that have pushed together and buckled up some right above a doorframe. There is a visible separation from that split up to the ceiling through my hallway. The portion on the ceiling just looks like where a join has come untaped though.
I only have one doorway with an actual CRACK from the corner (crack is in the drywall), a different doorway that is oriented lengthwise (the frame runs front to back along the house) which sticks, and everything else seems OK. I checked all visible portions of the foundation and nothing seems amiss.
Should I be worried about this?
I have watched it very closely since we moved in and haven't seen much change, though I do feel like the nails popping are more prominent now.
I'll post pictures tonight.