Bruce, a MN Galoot
It's the truss lift that's causing the problems. On the walls closest to the eave, there's no problem. Any interior wall on the vaulted ceiling, all the seams have let loose,me here there's the most movement. And even then it's only a 1/16" or so. I understand the requirements for taping have changed since this house was built 18 years ago. We likely wouldn't have the problem with the new stuff.
Thanks for your help.