you must to choose the rule layer and put the components side "not used", and in the soldier side "any". Take care, if the pcb is to much complex, they make short circuits, and route everything making shorts circuits, wait to finish, and choose the worst conection and unroute, is sad but now you must use interactive router to finish it.
I probe using diferent rules, etc etc....
If anybody known another maner to do it, telll me please.
If the pcb is simple Protel autoroute very well in single side.