R12: Compiling Forms and ORA-04023

A few days ago I shared a new MOS article that caught my eye, and here is another!  Why do you receive ORA-04023 errors when upgrading to R12.1.1 or R12.1.3?  Read note 1503874.1 to find out what the parameter _disable_fast_validate needs to be set at, and why it isn't set the way it is.