In WHM's "List Account" menu there is a option to change password. If the the account has a .my.cnf file in home directory a checkbox "Synchronize MySQL password" is displayed unchecked by default. If the account has no .my.cnf file the checkbox is hidden with default value as "checked". So, because the checkbox is hidden you dont know that the "change password" will also synchronize the mysl and you dont have the option to uncheck this checkbox. Sometimes you only want to change the cpanel/ftp password and because of the mysql synchronization the website goes down with a "can not connect to database, login/password is invalid" error. What I'm doing is "inspect" (using Chrome) the page, locate the "display:none" CSS and change it to "display:block". Then the checkbox is displayed and I can uncheck it.