Hi Whiterose (and NCH)
There IS a bug with this effect:
If you place two censor blocks on a clip both moving differently (say first one moving to the right and the second one moving to the left using keyframes for their start and end positions) and then play the clip, the second block will not move . It will remain at its last keyframe position.
i.e. If, for the second censor rectangle you set the first keyframe at the start of the clip with the block on the right and the second keyframe at the end of the clip with the block on the left, when you play the sequence the first block moves OK but the second block stays on the left, meaning its first keyframe position was not recorded.
This is a bug. To get around this you will have to remove (un-highlight) the effect lines of the first block from the keyframe pane before dealing with the second censor block keyframes.
If you want to use a second censor rectange you must first click the each of the highlighted tabs with the graph icon on it for the first censor block. Now you can use the keyframes to set the movement of the second effect. You shouldn't have to do this.
PS. The blur difficulty arose as I mistakenly thought this was was an all or nothing effect (either on or off like OVAL) but then I noticed it also had its own keyframe line. Doh!
Nat