A very serious problem

I have a problem with Blender that I can only think of as a glitch of somekind.
For some reason or other my characters get rendered missaligned. Not by a lot, but enough to make the rendered result just bogus.
It all checks out fine in the 3D viewport, even in rendered mode, but when I actually reneder with the camera something goes wrong.
Here look:

Here you can see Character A trying to punch Character B but Character B dodges and deflects. This is the 3D viewport. (Directly through the camera, aka; num-0 view)
https://dl-web.dropbox.com/get/Public/blendererrorrender1.PNG?_subject_uid=1071079&w=AABw7VIUTuBfMbgeXlZblxkjW4sCRyBP2TSeJQd9ofz0vw

This is the camera render. Notice how the position of the arm from Character A is shifted and the entire body of Character B is shifted somewhat.
https://dl-web.dropbox.com/get/Public/blendererrorrender2.PNG?_subject_uid=1071079&w=AABji2W07sZWFfQTNXDt4cL1eDwaRJPBx89Z8ilbnyu0Cw

How does this happen?
How is it solved?

Something went wrong with your images or links that you tried to post … nothing is there to see, except your description of the problem.

Well you haven’t done a good job making sure that we can see what you meaning (images, .blend files). But I think you might be in ortho view in the 3D viewport and it would therefore be perspective in the camera.

…what…? I can see the images o_o
Ok, let me try it differantly:

"Here you can see Character A trying to punch Character B but Character B dodges and deflects. This is the 3D viewport. (Directly through the camera, aka; num-0 view)


This is the camera render. Notice how the position of the arm from Character A is shifted and the entire body of Character B is shifted somewhat.


"

See them now?

3d viewport is showing another keyframe than your render ?

First thing I did when I saw that was go over all the key frames again to see if any of my key frames are in this position, but no, all is how I had placed it.
This is not the only keyframe this accurs, every other one where Character B dodges/deflects a punch from Character A is also missaligned when making a camera render.
I’m really hoping this is a problem like something I didn’t understand rather than a problem with Blender itself.
Here’s a dropbox link of the .blend file (since for some reason I cannot attach it here):


The frames in question are 81->160 wich was intended for the second render.

Sampled Motion blur > Shutter value 0 seems fix that.

… the motion blur causes that problem!? o_O
Well, I didn’t turn it on, or even notice any effect of it in the previous renders, so I’ll just turn the whole thing off.
But how can the motion blur setting caus the problem??

http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Post_Process/Motion_Blur