Thread:Project:Support desk/navigation bar and formatting disappears

After logging into my wiki and navigating a few pages the navigation bar disappears and the entire page is one long page without formatting. It started happening about a week ago. It will be fine for awhile then the formatting disappears. It does it on my iPad, laptop, ie chrome,Firefox. If I clear the cache it will be ok for a few pages or sometimes that doesn't help either. Installed software

Product	Version MediaWiki	1.18.1 PHP	5.3.13 (cgi-fcgi) MySQL	5.0.91-log Installed extensions

Appsdbainfo.com/wiki

It has a password. Because it was hack and there are 1000's of users created with random advertising on them. How do I delete theses?