Comcast Mpeg-4 issues: View but not Record

Apparently there's a problem cropping up with the Comcast transition to mpeg-4. I first noticed this on Friday, 7/22 when a movie I set to record on Cinemax failed to record and the reason listed in history was "not authorized" - even though it's a subscribed channel. Called TiVo and they went through a series of diagnostics checks and determined the cablecard was apparently incompletely paired and I needed to call Comcast. Saturday, 7/23, called Comcast at 7am and they re-paired the card with not change in the behavior - I could view, but not record as "not authorized." They said it could be the cable card and I needed to swap it out, so drove over to the xfinity store and did so. Got back, put it in and called Comcast to pair. They did so, but lost all my premium channels. After a couple hours going back and forth and forwarded to various departments, THAT was finally fixed. But the original problem was still a problem. Finally got it back to where I was on late Friday by Saturday at 1:30pm ( about 6 hours on the phone and half hour driving!) They scheduled a truck roll for today, Sunday 7/24. I cancelled that when I found a couple of forum posts describing the exact issue I was having. These posts are:
http://ift.tt/2a7qoXT
http://ift.tt/2a7qnmX

The threads show this happening in multiple regions, but only to Comcast users and Roamios.

The channels I've identified in Sacramento are:

763 DXDHDP
797 MGMHD
805 VICEPHD
806 NGWIHD
810 BBCAPH
813 DFCHD
814 UPHD
822 GSNPHD
825 SHOWHDP
838 MAXHDP

This is almost assuredly not comprehensive - they are just the ones I've tested with the relevant criteria (720 resolution, not the expected 1080).

I've posted a question regarding this to the Comcast support forum and a Comcast representative replied that's it's a know problem and that it started with the most recent TiVo software release and that TiVo is working on a fix, but I've not seen anything from TiVo confirming that.

I'm not looking for a magic bullet, push a button and find it fixed resolution. What I want is a more broad acknowledgement of the problem and a timeline for when it will be fixed. I don't care whose problem it is, I just need it fixed.

I don't need to subscribe to channels I cannot record.

I don't need a dvr that doesn't record my subscribed channels.

Don't mean to come across as a rant, but this is frustrating.