concret5 no longer working

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Hi, I installed concrete5 around a month ago, and all was working fine, now when I load my page It does not have the option "sign in to edit this site" can anyone tell me why this is and how i fix it,

 
Mnkras replied on at Permalink Reply
Mnkras
http://site.com/index.php/login
DigitalCrate replied on at Permalink Reply
DigitalCrate
if you have pretty urls enabled you can also usehttp://www.yoursite.com/dashboard...
A little strange that you say it was there, and now its not????
jordanlev replied on at Permalink Best Answer Reply
jordanlev
I think there's 2 possibilities for how this happened -- first of all, if you're already logged in it might not be showing you that. But more likely is that you changed the theme or modified the theme files.
If neither of those things are the case, then yeah that's really weird. Perhaps clearing the cache (Dashboard -> Sitewide Settings -> Debug) might fix it?
wendyait replied on at Permalink Reply
I cleared the cache, and it worked. Thanks