that's actually a somewhat "known mystery", because it seems to happen on some servers? with some browsers? Is this forum running on lycos? I am not sure / don't remember if someone found out what actually the reason is.
- try a different browser
- delete the template/subSilver/admin directory and re-upload in ASCII
- try the same with the language files
- clear browser cache
- what PHP version and server software are installed on the server?
Open notepad, copy&paste the above stated code, save as phpinfo.txt. Upload the file to your webserver, rename it with your ftp program to phpinfo.php and point your browser to the file. You should see an overview of your php setup. At the top of the page you should see the php version number, then search for SERVER_SOFTWARE.