slideshow fails to work for additional domains

I've had the slideshow module working on one site for over a year now. But every other domain hosted on this code base fails to display the images, although it does display the

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name_of_image.png"

copy. The image does get uploaded to the filesystem. The page source does appear to include a properly formed <img src="http://domain/path/to/image.png"> tag. I've modeled the file system settings after those on the domain which works. I've had this exact same issue on perhaps six or eight domains hosted on the same code which hosts the domain where the slideshow module works. I've taken to advising clients that they should use the slideshow module to upload their images, then manually create an img tag and set the Input Format to full html to have it display.