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http://www.advancedcustomfields.com/resources/limit-number-fields/


If wordpress does not allow any new custom field variables 
its because of a limit in php.ini

edit php.ini:
#  php -i | grep "Loaded Configuration File"

find this line and change from its original value to at least 1 or more
# max_input_vars = 1000  old value
max_input_vars = 3000