F4mtester not working (nothing loads). Help?

Hi all,
I just installed f4mtester to use with a few addons, only nothing seems to load. When I boot up the addon itself and try launching BBC (for example), I just get the “Loading” icon in the corner, and after a minute it disappears and nothing happens. I also tried using it with some other addons that require f4mtester, but they also don’t work. Anyone know what’s going on?