I have tried the TV Guardian several times and cannot get it to do right. I have tried all the different options and it either filters out common---not profane speech or it lets others go through. We just got the H3 and our closed captioning has been completely off since we plugged in. The TV Guardian works from the CC...so it is only as good as the CC is. I am not sure how the H3 could affect the CC but I just know it has not been correct since we got it.
I'm sorry to see that you have had this issue. I would like to assist you with troubleshooting this, but I will need some additional information. When you say that the closed captioning is not correct, do you mean that what is being said is different than what is on screen?