I rigged a character with the setup machine and was animating… it was working fine.
Then I made my character bend down, and the leg joints started twisting strangely… only on the left leg.
So I didn’t save and I reloaded, and the left leg’s joints were all collapsed into one point. Left leg is not working anymore… I have no idea how to fix this. 
Could you show a screenshot of your left leg joint hierarchy in the outliner?
It also wouldn’t hurt to refresh your nodes. You can do this by going to
Modify/Evaluate Nodes/Ignore All
and then turning them all back on by hitting “Evaluate All”
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