Since I’m a newbie to FW, perhaps that’s the problem. Could you help me understand what a “layer” is? The Inspector identifies it as a “Graphic Item” (which I have inserted into an html box.
Layers in an HTML sense are like Photoshop where they (layers) stack all on top of each other and are ordered using what they call a “z-index.” By building a site in layers it (can be) a series of layered items all stacked on top of each other in a layout.
If you have truly inserted into an HTML box as an inflow item then this effect will not work - and you should get an error to tell you so.
Try the graphic on a blank page and make sure it works there first.
And as Dan says if you can upload the page that has your problem to a server somewhere with HTML code set to more readable (File>Document Setup>Output) then we can have a look for you.