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Flipping IK ankle

Hi,
I’m trying to use a 3 joint leg setup as an arm, much in the way you might do it for a gorilla. I’m finding that once I rotate it 90 degrees so it’s out to the side rather than straight down, and then mirror it, I get strange results with the roll control. The original side works fine, but the mirror tends to flip the roll 180 degrees in a spastic and unreliable fashion. Is there any way or trick to get this mirror to behave?
I’ve tried taking the quadruped template and rotating the front lips 90 degrees and get the same thing.
Thanks!

Further investigation reveals that unchecking World Space Orientation Align IK ctl fixes this issue.

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