Cannot Edit Home Page

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I have two problems that have turned up suddenly:
When I log into my site, closetplace.com, and reach the Welcome Page, then click on the Back arrow--Return to Website, I am returned to the login page. If I go to dashboard> Home>Visit, I am taken to the home page but cannot edit the page. Any other page I reach on the site via the site map shows the editing toolbar at the top and allows editing, except Home.

The other issue arises when I navigate to Extend Concrete 5. I get a message in red--"The base URL of your site does not match a registered instance of the site. Please click below to authenticate your site again." I am not sure what that means. When I click the link provided I am taken to my Project page at concrete5.org--if there is an action I need to take there, it is not evident to me.
Thanks

closetplace
 
ConcreteOwl replied on at Permalink Reply
ConcreteOwl
The usual suspects for this kind of behavior is either a server cache running in the background (varnish cache or Cachewall etc.) or mod_security running on the server.