Cannot copy mirror some bones between keyframes I'm working on an 8 frame walk cycle, and I'd like to copy and mirror the poses of the first 4 frames to the last 4 frames. However, for some reason my arms won't copy mirror properly.

Can someone spot what I'm doing wrong?

Here's a link to my blender file:
http://pasteall.org/blend/index.php?id=50223
It looks like your arm bones are not well oriented:


In Edit mode, select the right upper and lower arm.
ctrl R 180 to make a 180° rotation


now it works