When I try to access my unraid admin page, I am getting an invalid content message.  This occurs in Internet Explorer on three of my windows boxes and in firefox on another linux box.  I have used the page before.  I am going to try my son's laptop with an older version of IE and see if it works.  I know I should upgrade, but I would like to make sure everything is in tact before doing so.

You must be using version 2.x of unraid?  That message comes up in those releases to indicate a problem with the license file on the Flash device.  Recommend you upgrade to latest 4.0-beta (4.0-final should be out this week).  Send me an email with your Flash info & I'll send you a Pro key.