I'm not sure if this could help, but (hope u know how to work with mysql managers, i.e. phpmyadmin)
try to execute this mysql query:
ALTER TABLE `4images_categories` CHANGE `cat_hits` `cat_hits` MEDIUMINT( 10 ) DEFAULT '0' NOT NULL
by default cat_hits field set to
SMALLINT( 6 ) I really dont know what's the difference bettween all those " *INT " types, but for some reason cat_id is set to MEDIUMINT ( 8 ) but hits to smaller value...that should be opposite I think