Red circle with line through it when trying to pull down pages in the page panel

For some reason I am unable to add pages by pulling down Parent Pages in the Pages Panel. I am also not able to move the pages freely using the Selection Tool. This just started this morning. I closed and opened another document and the same thing is happening. The only way I can add or move pages is with the Move Pages box. 

Facing pages is NOT on.

PLEASE HELP!