Pagebuilder is not visible

Hi!

I would like to use your plugin but unfortunately it is not visible on page or post edit at all. Sometimes I can see underneath the editor window the headline of the pagebuilder, but within a second it disappears. I installed the plugin again and shut down all other plugins as well, I changed the theme to one of the standard wp themes, I aktivated and reactivated the checkbox for responsive… but it still doesn’t work.

Do you have a clue, why this happens?
looking forward to your help 🙂
best, julia

http://wordpress.org/plugins/siteorigin-panels/