Using the file in T39819:
- Change Autosnap mode to "Nearest Second"
- Try to grab the selected keyframe -> keyframe should end up snapping to the start of the FCurve
- Cancel the transform (esc or RMB)
- Selected keyframe does not return to start
I'm not sure yet where this bug is coming from. It didn't seem to exist in 2.69 (when drawing times as seconds instead of frames, to trigger frame snapping). More investigation needed.