Do you know which software version you were on? This instruction is for software version 134R or higher.
On your CM-7500 remote, press Menu. Then select Settings>Technical Info>Version>Software Version. Currently the software should be 135R as of December 2017.
To turn CC on/off, please follow the steps below. I'll have you do a couple of normally extra/unnecessary steps that will confirm that yes indeed you are turning the CC on, and also to help you understand how to navigate that menu.
Please follow the steps below to make certain that you are on the right settings.
When I write "Navigate" that is using the navigation ring that is around the "OK" button (On the flat thin rectangular remote.)
When using the newer remote, the navigation buttons are the arrows around the OK/Select button.
On your remote, press "CC" or "Audio CC" button. Whichever button is on your remote.
Navigate to Closed Captions
Navigate to Captions
Navigate to "Off"
Navigate to ON"
Navigate down to "Caption Service"
Navigate to "Digital CC2"
Navigate to Digital CC1"
Then go to a program you would like to watch, and exit from the guide.
Press "Info" on the remote.
Check to see if "CC" is listed. If yes, press exit and the CC should begin to work.
If CC is not listed, then there will not be Closed Captions during that program.
Most commercials do not have CC info.