Sounds like the grouping might have been messed up a bit.... double check the group.. also see if the ik handels from the heel down are sticky.. maya 5 is a pain that way.
I dont usly use pole vectors in my legs... Once mike sees this he would have some more possible answers...
I am enough of an artist to draw freely upon my imagination, knowledge is limited, imagination encircles the world. (Albert Einstein)
https://www.artstation.com/kurtb