Create 4 key position images
Activate Rove Across Time for the second one
Move the last two keys into the Graph Editor
The second key multiplies with each move
Thank you for filing this bug.
I was able to reproduce this behavior and have sent this bug to our developers to evaluate.
Note that this problem only occurs when:
- You drag via the selection box in the Graph Editor view
- One of the keyframes is adjacent to a roving keyframe.
The problem can be avoided by clicking and dragging on one of the keyframes instead of within the selection box.
Bruno Quintin commented