Thanks for your responses. I am able to see CC on other channels. This is a long-term problem that I'm addressing for the first time.
I have the 940 (SD), 1840 (SD), and 4250 (HD.) I have two 4250's. One of them is showing the captions, but the other is not. This isn't a hardware problem. I imagine that my boxes are resetting at no greater, or lesser, frequency than any other account. I figured that with each reboot, that there was a check of the software. I have to compare what's running on my HD boxes.