Having CSS/JS issues with the PopUp! plugin backend

I manually installed the PopUp! plugin on my WordPress blog, but the backend doesn't seem to load all CSS/JS files properly. Please see the attached screenshot to see what I mean. You can see that the filters aren't loaded properly and can't be set via drag & drop. Basically any configuration except for adding content isn't quite working.

The WordPress is 3.9, the plugin is latest version (downloaded today).

Hope you can help me and thank you for taking the time to read this!

  • Vaughan
    • Support/SLS MockingJay

    Hi @Jan Koch,

    This works fine on my testing site.

    Can I ask you to try switching to the default twentyfourteen theme and see if the issue still occurs? If so, then can you try deactivating all other plugins and see if it still happens, if not, then enable each plugin again 1 by one until the issue returns, then we'll know if there's a plugin or theme conflict.

    Thanks

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