CBS in my area used to have serious CC issues but not anymore. I use Over the Air (OTA) antenna, not cable or satellite. All of my local stations are 100% digital (HDTV or SDTV). I contacted my local CBS station and they worked hard to fix it. I don't think it's a nationwide problem. If others are having CC issues in different locations, then it's most likely a local area problem.
I watched CSI last night and it was perfect.
Contact your local station or subscriber and hopefully they will be helpful to resolve CC issue.
Peter