Site Categories Plugin - Unable to add images per category, but default works fine.

Hi, I am unable to add images per category, but default image works without a problem. When i go into the per category, and edit the category,. the button to add an image just, well, does nothing??
Any help would be appreciated. I have already tried all 4 major browsers, and uninstalled and reinstalled the plugin. The browser console is throwing a few errors pertaining to the users sync, but thats only after i enabled it. Prior to this, still no joy.

Thankyou!