Yes. That's pretty strange. When I'm using german locale settings I can't select addresses via button in the address book, because Armory can't copy it in ASCII character format. As a work-around you can right-klick and copy the address and paste it into the field. When you do this Armory can identify which wallet this address belongs to. So probabbly the clipboard stores non ASCII chars and when you paste them into the text field Armory converts them back into ASCII?