I watched this the other day. Maybe it will help since Lightroom can have several processes working at the same time.
Have you thought of using the Warp tool in CS6 to straighten your pano? I find that Adaptive Wide Angle gets wonky on me sometimes.
Pano1: Your original with grid lines (gray) applied (percentage rather than a fixed number..set that in prefs.)
Pano2: Grid lines in red. Warp tool in gray. Nudge...