Just in case anyone's still listening. The most recent update, which included an nvidia driver update (340.96-0ubuntu0.14.04.1), pushed back the version of the latest kernel that worked. 3.13.0-58 no longer works. 57 gives bad resolution, I am testing 55, 32 still works. So it seems like whatever is causing my problem is being updated to work with earlier kernel versions.
Just in case anyone's still listening. The most recent update, which included an nvidia driver update (340.96- 0ubuntu0. 14.04.1) , pushed back the version of the latest kernel that worked. 3.13.0-58 no longer works. 57 gives bad resolution, I am testing 55, 32 still works. So it seems like whatever is causing my problem is being updated to work with earlier kernel versions.