Hard to phrase, so here a screenshot. I thought maybe it is related to topic being deleted. But found that only 1 of those 3 red ones were actually deleted. It does not seem to be related to votes. So what does it mean?
As proposed, grey-ish red background should indicate posts were deleted. Here is my example:
- http://stackoverflow.com/questions/13224612/undo-ftp-file-overwrites - page not found
- "Provider Load Error" when deploying SharePoint 2010 solution - page exists
- Why do I have to call SetLink()? - page exists