I open up a new thread for this and thanks for your response. I deactivated the Plugins and it showed up that “qTranslate” is the bad guy who is in trouble with PageBuilder.
My problem is, that at my “sbezziale.de” I have integrated 5 languages (DE/EN/NE/ES/IT) and at the other pages I mentioned in my first answer I also want to set up at least German and English.
qtranslate is available for wp 3.8.1 only but I tried to fix it using the code-snippets from here:
The languages are fine again after fixing qtranslate with that code but the problem with Page Builder shows up.
Is there another way to get it work with wp 3.9.1 or another multi-language-plugin you can recommend – it should work with Page Builder of course and keep my posts and translations. Or going back to wp 3.8.1 is the solution?