Thank you Esmi
I checked with my hostingprovider and re-installed WordPress. Now it works.
Thank you Esmi
it did not work.
But there seems to be a general disconnection between my wp-admin and ftp.
If I install new themes from wp-admin I can apply them to my website and also customize them. But in my ftp directory they do not appear…
…and yes: I have only one wordpress folder on my server…
Any other hints?
