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Blender newbie here. I have a problem mirroring poses that's giving me a headache.
When I mirror, for example, the left leg, the right leg isn't correctly mirrored; it's rotated for some reason.

I've read possible solutions and watched some videos, but I still get bad results.

This is what I do:
First, I create the bones I need:

I placed the 3D cursor at (0, 0, 0). I select all of them except the torso and head bones. I key Shift + D, then Esc, then Ctrl + M, then X, and finally Enter to create a mirrored copy. Afterwards, I key W to open the Edit Mode Specials Menu and select to Flip Names.

Once that is done, I go to Pose Mode and move some bones on the right side:

Then, with those bones selected, I press Ctrl + C, then Ctrl + Shift + V to paste mirrored, but this is what happens:

What could I be doing wrong?

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I solved my problem.
For every bone in Edit Mode, I had to set the Roll value to 0. Then, for some bones with Bone Constraints, I had to set the Pole Angle to 0 or 180.
Finally, I had to clear parents for my meshes and parent them to the bones again.

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  • $\begingroup$ As you have discovered, mirroring bones like this will lead to incorrect rolls. There is a symmetry mode in edit mode that will help with roll angles etc if you do this again. After flipping the names, you should enable symmetry on the x axis and grab and release all the bones on one side so sync all the properties with the other. $\endgroup$
    – Sazerac
    Sep 16, 2016 at 0:45

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