Using LRT3.3, mac os mavericks, LR5

I'm trying to get a zoom by crop starting 50 frames in and going to frame 120.

I've keyframed the ones i want and adjusted the crop in LR. Frame 1 to 50 are cropped tight: (0.327,0.023,0.826,0.606). Frames 51 to end are wide (0.072,0.0,0.928,1.0) . Only the crop columns are selected/checked.
If i select the frames i want to adjust, 50 to 120, go to tools>individual transitions> curve it sets the first selected frame the same value as the last (and all intermediate frames) effectively moving the cropped frame earlier by one and keeping the jump in crop values.

If I don't select frames and choose autotransition it does a transition from the first frame of the whole sequence, 1 to 120, not the keyframes i want, 50 to 120.

I'm sure this has worked in previous versions.

Animating crops with LRTimelapse is not recommended. Just export in 4k and make the animation in video post, that gives better quality because Lightroom always crops to full pixels and that generates some jitter. Apart from that the new render engine does not like sequences with changing crops.