FCPX, Phantom floating between keyframes.

Hi,
I have been a fan on FCPX but I have to say now I am using it to make simple animations on a tight deadline it is REALLY stressing me out. Ok so there is a glitch I cannot fix and here is an example.
(it does not matter fs this is on Text, and image or anything else)
So I may want to make a bit of text shoot out of frame to the right, this is what happens (in this example say the text is 104 frames long)
Key frame A (at say frame 0) possition full left of screen
Key frame B (at say frame 100)possition still at full left of screen nothing has changed.
Key rame C ( at frame 104) possition off screen all the way to the right.
Ok now here is where the problem is and please note for this to happen I dont even have to make keyframe C..... So now between keyframes A&B the text will float the the right and then float back to the left but there are no keyframes or anything else telling it to move.
WHAT IS GOING ON???
This has been happing everytime I try to animate anything and I have no answers, put two key frames down with no changes and the element will just float around between those keyframes for no reason.
Any help apreciateds.
Thank
Robin

I was seeing this yesterday. Its to do with how FCPX is interpolating the data between the two keyframes. In this case it thinks it wants to ease in and out from the two values, even though the values are the same, this is why you get the spurious motion between the two keyframes. In Motion you would simply bring uo the keyframe editor and set the interpoltion to linear. I couldnt find a way to do this in FCPX.
The way round it in this case was to get rid of the last keyframe so it stopped all the stupid unwatned movement. Then blade the clip in half and then animate the second clip as needed. Drove me crazy for a bit.
hth
adam

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