HELP! I HAVE A DRYWALL TAPE DISASTER!!! We just finished building a new single story house in Washington State last fall. At first the drywall job looked fine. We primed, painted with latex flat paint and moved in. Now in most of the rooms, the drywall tape is pulling away from the ceiling at the joint where the interior walls and ceiling meet. The part of the tape that's on the wall is fine. It's as if someone has pushed the ceiling upward about 1/8", leaving the wall intact but causing the tape to pull away from the ceiling. The house is standard stick-framed, 2x6 exterior walls and 2x4 interior walls. Standard 8' ceilings. Insulation batts to code, including the attic space. The roof has an 8x12 pitch and is trusses, not framed. I'm not sure if the trusses were nailed to the top plates of the interior walls or not. Note that this problem is not occurring at all, at the exterior wall-to-ceiling joints, its only on the interior wall-to-ceiling joints. Some rooms are especially bad, some rooms are fine and some rooms only have several bad areas. So the big questions are; 1) what caused this to happen, 2) how could we have avoided this, and 3) what's the easiest way to fix the problem. Thanks.