Thanks a lot, it worked. Now, why didn’t I think of that myself….
I use Firefox and it seems it is a browser problem. I just noticed with Chrome and Maxthon all seems to work fine.
Thanks for your reply. Both directories are identical. When clicking on “Pages” in the WP menu on the left, at first it wants to go to “wp-admin/edit.php?post_type=page” of the proper subdomain, but after some delay the link opens with the main domain name. Apart from the wrong domain name the link is exactly the same.
I did a complete re-install but the problem remains the same. I have installed many WP websites and it is the first time I encounter this problem. When I make a new page all looks OK when doing that, but it is saved in the “Pages” of the subdomain, which I cannot see.