filemanager and web-preview

[Echoes]

after i created a new domain on my root-server and uploaded the files via ftp, there are listed correctly in the file manager, but show different results whether i edit (i.e. index.html) with the integrated wysiwyg-editor or view it by browser-preview: in the edit-window i see my new index.html and in the browser-preview there is still the old index.html (cache is clean). all other files listed in the file manager (like index.php) cannot be opend in the browser. what's wrong?