A few of my users are reporting that some images are appearing broken. However, the images are displaying fine for others. One report was on Windows XP using Mozilla Firefox, another on a Kindle Fire HD. I've not been able to replicate the error on my end, so I assume it's something on their end, but more than one user is apparently having the issue.
Here's the thread where they've reported the problem: http://www.kh-vids.net/threads/images-not-showing-in-posts-and-sigs.137408/