I bought and uploaded Apex theme last night.  I began working on the main menu.  When I attempted to move the video landing page from under "Specialty Pages" to under no parent I noticed a critical error on the page.  

Also in moving pages around in Main Menu and assigning different parent pages and removing some pages from the Main Menu I noticed that some of the pages I removed from the menu seem to have also disappeared from Pages altogether.  

I gave Wordpress support access to the site to see what the critical error was.  They said it was in the core of the theme and to check with you to fix it.  The video landing page is one of the main reasons I purchased this theme.  Could you please help me out here?  Also, could you let me know how to find the Pages I removed from the Main Menu which are no longer listed in the Pages dashboard.Thanks!