Many thanks, esmi and bh WP fan, for your advice. My site is new and I have no plugins installed. I have made the procedure to chenge the theme through PHPMyAdmin, but I got no results. When I came back to dashboard, I found that in Appearence-Header TwentyTen was installed, but in Editor and Themes was still Crispp installed. So I have activated TwentyTen.
Now Editor, Theme and Header are all switched on TwentyTen, but the problem remains. If I get the html code through Kompozer, what I get is:
<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN” “https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”>
<html
xmlns=”https://www.w3.org/1999/xhtml”><head><meta
content=”text/html; charset=ISO-8859-1″
http-equiv=”content-type” /> <title>home</title></head>
<body>
</body></html>
and no sign of themes and/or published pages.
My site is https://www.artismirror.com (on BlueHost)
I really cannot understand what happens.