Here's another unrepeatable "glitch report" . I don't think it has anything to do with ATP, but I'll mention it just in case.
I was adding a post to a thread under a tip or Idea. The "Enter" key stopped working! (AKA "Return" key.)
So I typed the reply in Notepad instead and copy-pasted it into the thread. That worked.
Then I tested a post in a forum thread: same thing: "Return" did not produce a newline. neither did the "Enter" key that's part of the numeric keypad.
The cure: exit ATP and re-enter.