I could swear that this was working as recently as a week or two ago, but I am unable to copy/paste keyframes in the Animation window. I've tried clicking individual keyframes (so they turn blue), pressing ctrl-C, then moving somewhere else in the timeline and pressing ctrl-V. I've made sure the scrubber was on a position with a keyframe under it. I've tried using "Copy" from the edit menu, I've tried Duplicating, and nothing seems to work. Did I just imagine that this was a feature?