I used to have about 160 menus/submenus/subsubmenus on my menu page.
160? Don’t you think that this is perhaps a little OTT? You are probably hitting a custom menu limitation issue.
Joe –
My website is an informational one, and I have many years of archived articles I just took from straight html and created as WP pages. The secondary menu on my site is in that realm of item count (using twenty-fourteen), and I was having the same issue. The actions I found in that article worked:
Create a php.ini file (I put mine in the root directory of my site).
Edit it so that it contains:
max_input_vars = 5000
suhosin.post.max_vars = 5000
suhosin.request.max_vars = 5000
(the article recommended 3000)
That by itself didn’t do anything, so I contacted my web host, and they did something – stopped/started a service, rebooted, whatever – and it took effect and now I have no issues.