Answered
Transform Effect - enabling motion blur changes image position
- Create a sequence with a resolution 1920x1080
- Take a 4k or UHD clip and put it on the timeline.
- Apply transform effect.
- Do a scale transition from 200% to 50%. (Two keyframes)
- Playback and effect does zoom out with picture centered. All looks ok.
- Go back to first keyframe set Shutter Angle to 180. (Note that position of image changes immediately.)
- Playback and notice that the picture is no longer centered.
You will only see this if the clip is a different resolution than the sequence. (higher or lower) On a Mac Studio, but this also does this on iMac. Has been this way for years. Only solution is to next the clip, but we should not be nesting to fix bugs.
