Does not work with some plugins

Hi,

I’m using the book review library plugin with the theme and it doesn’t allow me to upload a featured image (book cover). It always switches back to a blank entry, as seen in the screenshot. This does not happen with any other theme I’ve tried. Is something in the theme conflicting with the plugin?

Edit
To add: I’ve contacted the plugin developer and he says that the plugin does not use any javascript that could affect the image uploader.