The web clipping feature does work as advertised. Of course, need to enable web clipping by selecting the icon or via the menu pulldown. Since the image clipping works, I assume you have.
Please check you security settings in IE for .net components and active x controls. FTM will use the ie9 settings. You may need to restart FTM for the changes to take effect.
I was able to inhibit the web clipping by just changing the active x scripting option to prompt. Apparently FTM does not allow propting. And apparently the web clipping is an active x control.
Also, be aware of the securty settings for the zone the web page you are trying to clip is in (internet, trusted, restricted).