Hello Mike,
thanks for your response. I have uploaded the screenshots again at the same links, provided above. I took them down earlier, because yesterday I managed to solve the problem. It seems the plugin broke because of redirecting site traffic to a subfolder on my FTP. When the main domain address is redirected to a subfolder in cPanel, the plugin brakes even on a clean installation of wordpress on a clean database.
I had to change the structure of folders, reconfigure wordpress URL and site adresses to match it, and move the index.php out of the main wordpress folder, making suitable changes in it, so all the paths match, and it works now.
The starngest thing was, when broken, WP tiles corrupted page and post edit pages in WP… But anyway, all is fine now.
Thanks again.
brhplus