Moving the knee pole doesn’t update the pose until I move the bone that controls the leg. This is very strange and I’m wondering if there’s a way to make it update in realtime for easy animation.
I edited the OP with the link to the blend file. blend-exchange doesn’t allow updates unless there’s a stack exchange question associated with it so I used mediafire instead.
I can’t get what you are describing, but apart from that I’m a bit perplexed about your bone organization, classically the shin should have the IK constraint, with footC as Target, here footC has the IK, it is the child of shin and it has no Target, are you sure about all this?