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Have you tried loading the images directly in the problem browsers (Chrome, IE, Safari) and see if the loading works any better? If something loads differently based on the browser, that's unusual with Flash Player. I'd see if the browsers themselves are having trouble with the chunked files before tackling anything inside OSMF. I know that certain browsers send different HTTP statuses than others. It is possible that a chunked file is sending a status before the entire file is loaded, tricking the Loader into thinking the file is complete. Adobe notes that the following browsers don't send statuses to the Flash Player: Netscape, Mozilla, Safari, Opera, and Internet Explorer for the Macintosh. That doesn't line up exactly with your list, so that may be a red herring.
Also, on the matter of getting around the image loader, you could use your own media factory to pick the loader and element type through a custom MediaFactoryItem. If you specify an ID other than the standard OSMF ID for MediaFactoryItems (org.osmf), it will get used before the standard MediaFactoryItem for that media element type. Check out the MediaFactory's resolveItems() method for how that works.
Thanks for your reply.. The pictures load and display nicely in all browsers..
I got around the problem, by making a custom mediaelement that loads the image with Loader, on this I added a PLAY trait, so that the image can work as a posterframe/splash image before a videoclip, when autoplay is false.