Hi, everyone.  I've been using DNN for over a year now.  I'm a little slow on upgrades, so the site still uses 4.9.  However, we now have an error which is occurring for all users on several different browsers.

The top menu is missing.  The home page will load, and because there are a couple of links to other pages, clicking on those links will get me to those pages.  The search function can pull up links that get me to other pages.  I can log in as admin or host.  In no case does the top menu appear or function.

Because of this, I cannot access any admin or host pages except those in the DNN area at the top of the page.  I can't see Pages in particular, which means I can't view events and see if some error has brought my website down.

I've had to take the site offline.  Any suggestions about what I should look for or what I should do next?  I haven't yet reloaded my backups, partly because I'm not sure what could have caused this in the first place.  Any help would be appreciated.  Thanks.  Ken

After several attempts at uninstalling and reinstalling, I finally assumed the problem may have been my source of instuctions for installing. I did another uninstall, followed these directions http://www.dnncreative.com/tabid/289/Default.aspx?PageContentID=122 and it worked.

If anybody is interested--I did find a fix to the problem, but it is not a happy one.  The site has apparently been subject to an attack.

The evidence:

1. Every javascript file in the /js folder (and at least one in the Events module) was replaced by a file bearing the same name.  I could tell the replacement because the upload date was months after the latest upgrade.  Because none of the scripts actually worked, the menu didn't work either.
2. Likewise, the default.aspx file had been replaced and included an extra javascript line that looks an awful lot like an encoded uploader.

I'm getting in touch with our host, but I don't have a lot of hope.  Security seems to be pretty lax.

Ken