Dear Nikko,

thank you a lot for your quick reply. My current Parent Theme (Enfold) Version Number is 4.5.2

I just made a backup and saw that I recieved an email saying the following:

Hi Haarkunst-Trier,

We’d like to let you know that an update to your item Enfold – Responsive Multi-Purpose Theme by Kriesi is now available in your Downloads page.

Remember: you need to be logged in to download the update.

Login as Haarkunst-Trier and download this update

You may manage notifications for your items from your downloads.

May it have to do something with this? I never did this update, so maybe this caused the problem?

Thanks and best regards