Sometime in this game, some of the units do not respond to a move command.  One of my sovereign units, Keappol, is in a stack near my capitol (the name keeps changing).  She is also to the northwest near an opponent's lonely outpost.  I can click on her and give her a move command, but she does not move.  Once I am on one of these paralyzed units, the end turn button stops working.  A save and reload gets things working again as long as a paralyzed unit is never selected.