I'm hoping some techie out there will know how to help me! My cable channels go through a DVR box. All of a sudden, the captions changed to black box with a purple background and black writing. It is nearly impossible to see during the day or with very light/bright backgrounds on the screen. We didn't change any of the settings! In fact, the captions option only has on/off/muted and no color options. Even more strangely, while anything recorded on DVR uses the purple background/black writing, some but not all of the regular tv stations have the traditional white on black CC. Any idea how to change this back?