Here is the crazy thing of the week:

Someone pulled up our HTML docs in IE6 and couldn’t see any of the screenshots.  They looked at the HTML and it was valid and the images were pointing correctly to our PNG images.  They came running to me and I pulled them up in Opera and it was fine. I pulled them up in IE6 and, sure enough, I couldn’t see them either.

I copied one of the PNGs to another file name and double-clicked on it. The file displayed correctly in Microsoft Photo Editor.  I did a Save As and saved it under the original name.  The new version was almost half the size of the original!  And it was able to display in IE6!  And everything else!

Strangeness.  Not sure what MS did in their last security patch, but it really screwed things up.