Rigging Problem

[Diurno]

Hi guys, i'm doing a little rigging on a Box with arms, i've almost finished the rig, but i've this problem, when i move the Hand effector i've this:



(i dunno why with firefox the gif is not animated)...

by the way, how can i fix this?

thanks ^^

[geoath]

i can't be sure but it looks like an up vector "conflict"
press Shift+s in the viewport, then select Chain Critical Zone on the Attributes tab.
this will show u the chain resolution plane ( a triangle with doted lines)..
check what happens with this triangle while u transform the effector..

[farhaad_yousefi]

it is up vector problem i had the same problem..