I've used WP a bit and know about page settings. Today I've had two particular pages (not connected) disappear from the horizontal navigation. The pages showed in dashboard and when URL entered manually. After changing/checking settings I eventually deleted the two pages and created new ones, with same names. They showed in nav bar. But later, the same two pages disappeared again from nav bar (still showing in dashboard). One was parent page and one was child page (other child pages under same parent show OK). I'm not using custom menu or page widget. What can I do to fix this? Thanks.
The blog I need help with is businessdevelopmentstudio.com.