Just exprerienced a problem on my CS6 master collection. Since I have uninstalled my CS5.5 I can not see if this was present before.
Anyway here is what I have experienced.
I have a timeline in Premiere where all the clips are in reverse speed and each clip is dissolved into each other with opacity keyframes ( Each clip has in and out points).
When you copy all items in premiere and then paste it into a new composition in After Effects. Opacity keyframes are misplaced. I believe that after effects reads the keyframes as if the clips in premire were not in reverse speed.
Europe, Middle East and Africa