Wow wolf359, you're right. I went back to my old animations that use IK, ones that I said never gave me this issue, loaded a second loop, and the feet got jumpy on the first loop. I can't believe I never noticed it before... I usually just render one loop then loop the actual video in a video editor for a seamless animation.

 Yeah it's for the feet/hand pinning. I can't believe how difficult it is for something as simple as that. :/ This is so disappointing.

  I took your advice and turned off the IK and then I used a smoothing method of  deleting blocks of two frames at a time on the collar, shoulder, hand and thigh, shin, foot. This seems to have helped. There is still jittering, but it's less noticeable. I'm a perfectionist so this is frustrating, but oh well.

 

Since that issue is solved, onto the morph problem:

Could the problem be that two of my morph injections I loaded are using the same channel? For this animation I loaded Ralfeta's bend morph and PoseidenTech's Misty.

 Or do you think it's the IK only that's causing these weird bugs, like me seeing the mesh expand and stuff as I rotate around? I guess I'll find out soon when I start saving out the non-IK version. Will keep you posted.

 Thanks again guys. :)