That’s it!!!!! Thanks so much. No idea how that worked but so glad it did.

Ok, I fixed it. It was probably the case of some sorts of *ghost* keys.

Anyway, even easier than I though it to be:

Merge 2 clips as you send them to me (with transition and sliding)
Sample Motion Clip > Sample All Parts - Optimized (at this point the clip is already fixed)
Now just do Flatten Motion Clip > Flatten All Parts

I tried that and it didn't work. I just emailed you a link to the stripped down project. I've tried everything, so thanks for the help. 

I did. I left space between the two clips and there is no movement....

Flatten both clips (if there is any single key present in any of the clips)
Do not leave any space between them
Merge clips
Flatten again
Find the exact frame where abrupt transition occurs
Break the clip at that point. 
Space clips and drag the transition out.

If that does not help, post stripped project with 2 clips and a character if you can and I'll try to look at it.

Nothing seems to work. At the end of clip one and the beginning of clip two the character is in the same position. The only difference is that the arms and head move slightly. If there is a transition the character slides back and then forwards during the transition, but is at the same starting point by the time the second clip starts. I’m not having this issue with all clips, but with enough that it’s becoming an issue. It doesn’t make any sense.

Try to break the second clip at the beginning by cutting off the frames where the second is exact the same as the end of the first.
Delete this part and after that, either it works without transition or make a small transition...


Toystorylab on Vimeo :     Crassitudes (my "Alter Ego") on Youtube: 

I did. I left space between the two clips and there is no movement. When I record the clip it adds a transition in between the two clips causing it to slide.

Remove the blend before mixing down, so it no longer slides. Then you can break the new clip at the transition point, and add a new blend.

Hi Rampa. I tried that and now the section that had no transition has the transition added where the character slides out of position and back.

Try what I call a "mix-down". After re-recording the whole sequence into a new motion without the blend, you just cut the new clip to add a blend where you need it.