@ catacaustic
Thankyou for solution.
I had the same problem with max_input_vars and solved the issue by:
1. Editting php.ini file and searching for “max_input_vars” and changing the value to 3000 (previously it was 1000)
*** Dont forget to remove the “;” at the start of the code line to make this change take efffect
2. Moving the php.ini file to wp-admin folder of the wordpress installation directory
3. Problem solved
if you don’t find php.ini file in your wordpress installation directory, you can creat one by going to:
c-panel>php config
and just pressing “Save Changes” button. that will creat a php file in public_html directory, then you can move/copy to the location you want and then you can edit the file.
Note: i was using Bluehost and they alloow to change php config. please check if the option of “php config” is available in you c-Panel
Thankyou WP Community once again.