I was in the midst of writing a reply to a thread when I noticed that I had mysteriously been logged out by the forum software.
So I opened a new window, and logged in so I could get back to the topic and start a new reply, the way I do on other systems that have login "timeouts".
Much to my horror, when I went back to copy the reply text from the original window to the new one, I discovered that something had forced an update of that window, and erased everything I had written.
This is worse than merely stupid: it's downright evil, and a fundamental violation of the client-server relationship.
Somebody needs to be spanked for doing this.