I guess I'm just too used to seeing "from x to y". Sorry.
But the problem, and the report that it might not be the case in some circumstances, usually does bear repeating.
It has been a frustrating day. There are very high winds here in central Texas today, which have caused several brief power blips. Each time the 4520 lost power, it also reverted to a prior configuration. This forced me to re-load from backup each time. I opened a case with Denon last year when I was experiencing the same problem with my 4311. Although they promised to escalate the problem to engineering, the case was closed with no answer. I called Denon back today, and reported the same problem with the 4520, and once again they will escalate to engineering. I'll report back if they provide an answer.
Correct me if I am wrong, but it is not recommended plugging a high-current device like an AVR into a UPS.
Edit: Just had another power failure. This time the 4520 did not revert to a previous configuration. I love consistency.