My Cablevision issue is now resolved. The Moxi support team did push the software update to my Moxi and Moxi mates. My older version of software that had the channel tuning problems was 188.8.131.52M4BR-P.319355. The new one that works with SimulCrypt is 184.108.40.206M4BR-P.338830.
I am happy that Arris was still willing to help with this. They did send me a note explaining that they were doing this as a courtesy even though I had voided my warranty by opening my case (I was already outside of the year's warranty anyway). See the email below...
We have completed review of this issue. Although we have targeted your Moxi HD DVR and Moxi Mates for the software patch to offer support for Cablevision's changes, we cannot provide any support if you run into any issues downloading, installing, or operating with that build. To attempt to download the updates, go to Settings > Diagnostics > Service Status and select "Update Software."
We see that you've opened the casing on the Moxi HD DVR which prevents us from providing you any further support for your Moxi HD DVR or Moxi Mates.
As the casing has been opened, and the Moxi HD DVR and/or Moxi Mate tampered with, any warranty coverage such as repair, replacement, and escalation is now null and void. This includes out-of-warranty services as well.
We will no longer offer any support outside of limited basic assistance with items unrelated to stability, recording problems, abnormal noises or temperature levels, and possible software issues.