For a while now I have noticed that avatars will sometimes disappear after a page has fully loaded. That is, the avatars are visible while the page is still loading, but when the page has finished loading one or more pictures are no longer displayed. I mainly use Chrome, but I believe I was able to reproduce it once in IE (the "red X" placeholder showed up for IE*, but I was able to retrieve the URL of the image and successfully load it). Because of the seemingly random nature, I have not been able to reproduce this on demand.
It doesn't appear to be a critical problem, but I wanted to make sure the admins had heard about it. Or, alternatively, figure out what fix I need to apply locally.
*(whereas Chrome only displays a blank space where the image would go)