Most likely your web server is configured with PHP settings that are too low for a theme with several plugins. Specifically max_execution_time and memory_limit. Thus, the web server is rejecting to save the changes. This is not a theme fault or bug.


You need to ask your web hosting company to increase your PHP limits.

  

Recommended PHP configuration limits are as follows:

max_execution_time 100

memory_limit 256M

post_max_size 32M

upload_max_filesize 32M

 

You can verify your PHP configuration limits by installing a simple plugin called WordPress phpinfo.