If you want to revert back to the NR (National Release) do the same steps as you did to get the CE, outside of the CE time frame ..... remember, you may be going back to the old GUI as well.
This is what CE TESTING is all about, running thier new software and seeing how well it works and what doesn't work right.
Not everyone does it, which is great, if your into it, fine, if not , your not (not saying you one way or the other)
This is what it's all about.
To answer your other question, Yes, typically they have a CE every week, it's posted in the CE section when the notes are up, someone typically will start a thread as well to discuss it, like the one your in now.
Hopefully you read the Do's and Don'ts before D/L ing the first time so you knew what your getting into.
People will often hear about something new and not have any idea what they are d/ling and do it anyways and ask why such and such is happening.
http://www.satelliteguys.us/directv...2-directv-cutting-edge-program-terms-faq.html