Very strange crash to desktop

Hi, I have a very strange CTD issue when selecting a PBD waypoint in the DIR INTC function.If I for exampe type PAE/160/20 in the SP and then I push the 1L LSK (Dir To field), then a new screen pops up and asks me to select one of three "PAE's", so i select the closest one (present position is KSEA) and then the everything crashes to desktop.BUT, instead of typing PAE/160/20 in the SP i could type SEA/340/10 in the SP so I dont have to choose from diffrent "SEA's" (theres only one) and then everything works fine.Is there anything im doing wrong?Gustav