Click for more information about this bug. (Updated)As has been pointed out by some FHDCers, some pages will hang while loading images, and then your browser will never see images again untill you restart or reboot. The problem is that MSIE breaks when trying to load images created with Photoshop 7 and saved in the default way. I had posted that a browser upgrade would fix it, but apparently this doesn't work.
There really aren't any good solutions to this. If you're creating a .JPG avatar with Photoshop 7, you should use the "Save For Web" option instead of "Save". If you're having problems with hanging, then someone uploaded an avatar that chokes IE. Let me know what image it hangs on and I'll blast it. I don't have a good way of filtering these at the source, but I'm trying some things out that will hopefully work.
Regardless, if you're using IE, you're at risk for this anywhere you go on the Internet. As Photoshop 7 becomes more common, this will happen more often. If it bothers you, I'd recommend trying a different browser, such as Phoenix, Mozilla, Camino (for Mac), or Opera. All of these are great browsers that are at least on a par with IE, if not better (tabbed browsing, pop-up blockers, etc).
Here is some more information about the problem. Thanks to Paul Beasi for helping to track this one down!