Hello,
I fixed this. It was from the SuperMessenger plugin. This plugin uses a very minimal set of css and javascript, that we had them added inside the plugin's php file, instead of creating a different css and a different js file. Seems CB Mass Emailing doesn't like this, so we moved css and javascript to individual files. We fixed this on your site.
For all other users getting this problem, please re-download your SuperMessenger CB plugin, and re-install it.
Thank you,
AXXIS
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