Some weeks ago I reported an issue that sometimes occurred when the new-articles timer went off, and I was reading a thread thus:
What would happen, and still happens but not always, is that the articles I was working through would all be marked as read and hidden, with any new articles being listed in the article column. This is annoying as I have to click on the Unhide button, find the thread, and work through it again to be sure I've read everything.
Has anyone else seen this?