Many of my pictures and other items are not showing up.

The most likely cause is that you have deleted the .htaccess file from your site. This file controls access to your web site. If this IS your problem, then you will have to submit a Problem Report and have your site checked.

Another possible causes of this is the possible mispelling of files or an error in the case (UPPER/lower) of a filename vs it's link. The spelling AND case of a filename MUST match exactly the link to the file.