Didn't work and messed up your site

First of all, the plugin did NOT work. Even if you use external image, WordPress featured image still shows up. After testing for a while I gave up and just use WordPress featured image. I didn’t deactivate this plugin (as I thought I would want to test it again later) but when I came back to my site a few days later, no images showed up on my site AT ALL. No other sites of mine hosted on the same server had this problem.

I’m positive this plugin is the cause, because I didn’t do anything else other than installing and testing this plugin. I read that somebody else had the same problem too, so I’m guessing it’s something to do with how the plugin was coded? I don’t know, but I’m done with trying to make this plugin work.