Entering a gnav flight plan shows up on the 5600 but when I go to execute a leg from 5600 it asks me if I want to switch to internal flight plan. Mistakenly said yes, but then if I go back to gnav flight plan and try again to fly leg it takes me to internal flight plan which has empty routes. It locks into internal flight plan and doesn't allow the gnav flight plan to be active. Requires reboot to fix. Is there another way?