I know it has to be something on this particular computer, but I have already gone into Internet Options/Security - Custom Level and anything to do with srcipting is either enabled or prompt; also Internet Options/Programs/Manage Addons and Java is enabled so am at a loss as to what to check next.
Is there anything specific that you can suggest I check?
Just as an experiment, I disabled all JS in FX and yes, it displayed all the images as in IE9. I'll try re-setting IE settings.
Yes, that did it. All good now.
Thanks for the explanation!