If you are unable to save Muffin Builder items or Page options anymore, it means the problem is max_input_vars variable on server side. By default, on many servers, the value of this variable is set to 1000. This is enough for users who do not build pages with large amount of content. But if you are planning to create larger pages, we recommend to increase this variable to 10000. This variable can be increased under .htaccess file with additonal line:
php_value max_input_vars 10000
There is also another solution you can try as it works in some cases as well. Under public_html/ folder on FTP, create .user.ini file with below content:
max_input_vars = 10000;
However, if any of above solutions won't help, then you must contact with server administrator because it means that only admin is able to increase this variable.