and one of them is that there can be randon glitches on publishing a site to the server. One of these glitches is that duplicate graphics or image files can be created, and sometimes you'll see a file outside the images folder when there's already one inside. The duplicate file will often have an underscore in front of its name.
There are other possible anomalies, but they aren't serious, and I won't go into them now.
One way to help things along is to do a bit of preparation prior to publishing the site from your hard drive. When you publish your site NOF will create files and folders on your local drive in preparation for uploading the generated HTML code to your server space. The folder within your user site folder that is created is called "Local Publish" by default. Just prior to publishing the site, navigate to your NetObjects/User Sites/name of your site/ folder on your hard drive and delete the "Preview" and "Local Publish" folders. Then go into Assets view in NOF and check for duplicate filenames - if you click the 'Names' tag your files will be in alphabetical order, so you can check more easily.