I use a menu on my site which has a large number of entries. The top levels are pages and then underneath the 'Blog' option I use all my post categories as menu options (it's a sports blog covering multiple sports, leagues, etc).
I use the Graphene theme and everything was fine until I added a new category today - when I updated the menu to include this it wiped 80% of the menu so I'm only left with two top-levels and hardly any of the post categories.
I hadn't updated the theme so I suspected this was the issue initially but even after updating that I've rebuilt the menu and I'm still having the same problem.
Anyone have any ideas? Thanks.