Okay, two updates. The first is that I have found a workaround to the issue! I posted it to the AVS thread first, so you can see that there, I am hoping to do a nice tutorial here soon.
The second update is also related to the forum: someone there works for Comcast and is working to get the issue fixed! If you have this problem, please see the forum post and reply to the guy there with the info he requests. According to them, the engineers are looking at the issue.