Attempted read off end of buffer

[Colin Allen]

May 10 08:38:14  http://216.166.18.37/giro/images/SA.gif (OIGifImage):  
Underflow: Attempted read off end of buffer

I have been seeing this message in console, and the corresponding broken gif  
images, in a number of web pages recently.  The gifs are displaying  
correctly in other browsers.  So what does it mean and why does OmniWeb seem  
to be the only browser that has problems with these links?
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Colin Allen
http://snaefell.tamu.edu/~colin/