Hi,

First of all, thanks a lot for all the services you've been providing to the Internet community at large for the past... I'm not even sure how many years!  I've been using the validators for almost ten years now, and plan to keep using them for a lot longer, and I don't even know how to thank you for all the standards processes you've got going :)

Now, this bug is not about the validator per se, but about the moz_logo.jpg file used in several places on various *.w3c.org websites.  This JPEG file, it seems, has been encoded in a YRbCrK color space, not the usual RGB one, and some browsers have lots of trouble displaying it.  This was first called to my attention by a friend (CC'd), who wondered why IE 7 and IE 8 on Windows did not show this logo; and right now, as I'm writing this report, it turns out that Firefox 2.x on FreeBSD doesn't, either (which makes me wonder a little, this shouldn't really happen, but that's a separate FreeBSD-specific problem on my end :)

When I downloaded the image, converted it to PNM using netpbm's jpegtonpm program, and converted it back to JPEG using pnmtojpeg (again from netpbm), the result - http://things.ringlet.net/roam/misc/mozl.jpg - displays in all the affected browsers we've tested so far, apparently because jpegtopnm groks YCbRkK and pnmtojpeg silently creates an RGB JPEG file.  So it ought to be simple to fix this - or you could even use the above-referenced mozl.jpg file as a quick bandaid :)

It turns out that this is not an isolated incident - a Google search for "YCbCr Internet Explorer" found at least one page - http://forums.oscommerce.com/topic/353800-how-to-ensure-your-images-have-valid-filenames/ - that seems to reprot the same conclusion - IE only able to display RGB-encoded JPEG files.

Once again, thanks a lot for all your web-related work, and sorry for wasting your time on such a trivial matter :)