Hi Guys,
I've got the same problem on my site. I've downloaded the files and installed in the directories specified. Unlike the others users here, I had these files all along. When I added the new ones, the "Add to Favorites" button still does not work. In my case, clicking the "Add to Favorites" button has the same effect as click "Refresh" button on the browser.

Has anyone got any suggestions for a fix!?

Thanks in advance for any help.
Regards,
Liam-Og