I can't smush not even one image unless I disable Visual Composer 4.9.2 (latest version). The button spins. I inspected the element - Console:
"Uncaught TypeError: Cannot read property 'error_msg' of undefined" for wp-smushit-admin.js line 266"
As soon as I disable the Visual composer 4.9.2, I can smush files.
Obviously I don't have to mention that Visual composer is key to almost any website (permit the usage of dozens of shortcodes and visual rich edition).
Please tell me you have a fix for this. I've just bought the plugin and this is a big let down.