Users have complained a few times about seeing a bizarre set of pink or green stripes on our webpage. At first I thought there were a rash of video card outages, but then someone sent me a screenshot from their browser (IE8). I later saw the same thing, but with slightly different colors on Chrome. Users have experienced this on their iPads and iPhones (iOS Safari). Because I've optimized the site to cache images, the bad image stays around until you clear your cache, so once you do, it resolves itself. My assumption is that the transmission of the image is being cut off mid-stream and then staying that way, but I can't for the life of me figure out why. Here's what I've checked:

Header length is being sent, and transmission looks okay (wget sample below):

wget http://www.superiorlivestock.com/templates/sla2/images/wallbg2.jpg
--2012-04-05 08:46:00--  http://www.superiorlivestock.com/templates/sla2/images/wallbg2.jpg
Resolving www.superiorlivestock.com (www.superiorlivestock.com)... [ip redacted]
Connecting to www.superiorlivestock.com (www.superiorlivestock.com)|[ip redacted]|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 45926 (45K) [image/jpeg]
Saving to: `wallbg2.jpg'

Images are not being served gzipped (apache conf below):

SetOutputFilter DEFLATE
SetEnvIfNoCase Request_URI \.(?:gif|jpe?g|png)$ no-gzip dont-vary

The site is www.superiorlivestock.com, and here's a sample of the bad page load:

Is there something obvious I'm missing? Am I saving my images in the wrong format somehow?