no. really there SHOULDNT be a reason, but sometimes, exceptional circumstances makes one parent or the other wait until there are court orders in place.
is for you? or a bf? or family member?
just curious.
if there is a GF or BF involved, the other spouse may not want the kids around the OW/OM and if the stbx wont respect that, the other parent may with hold the kids until there is a court order.
other reasons one parent doesnt give 'free access' to the kids, is due to abuse, or concern that the children will be taken. (both are extreme, im just saying...)