Hi saguaros,
thanks for your response. Unfortunately I don't have FTP-account data to this installation, since it's not on my server. And, to be fair, I have to admit that I have security concerns publishing my own server-data for the other installation. But I really appreciate your help and I know that my concerns are getting in the way of a solution.
I mean, if so it then had to be a JS problem that occurred on two servers/hosts independently at the same time.
Could you point to what I (he) should be looking for?
Thank you.