When I tried to add this image from my computer at the main site,

I first got an error that the image (after uploading) couldn't be found, and then this strange image showed up (screen snapshot):

I gave up and linked it to my own web server.

• Last night it would not let me post a jpeg of Pascal's Triangle on an MSE question, but it worked fine this morning. – Will Jagy Jun 28 '13 at 19:43

• Thanks, Geoff! $\mbox{}$ – Joseph O'Rourke Jun 28 '13 at 12:44