Brian, I'm with you.  It's easy to cure this problem if you partially 'boil' the potatoes prior.  I'll put them w/liquid on top of the stove for approx. 
10 min. to soften the 'taters, then they're good to go.....
 <img src="http://www.traveltalkonline.com/forums/images/graemlins/handshake.gif" alt="" />  Contessa