I am trying your mailpoet out for the first time. I have reviewed your FAQ info on this issue and folder permission is set according to your instructions. I have uninstalled and reinstalled as instructed. However, I am still not able to see the social icons when I drag and drop them, when building the newsletter. They do not appear. I can see images and such just fine. It is strictly related to the social icons, it seems anyhow. Do you have any suggestions? Thanks.
https://wordpress.org/plugins/wysija-newsletters/