I can't login after update

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After the latest update I can't login anymore. When I try to login, I'm redirected to my website, but without a edit-toolbar. And 'login' disappears from the URL. What to do?

 
hutman replied on at Permalink Reply
hutman
Hello, are you using Internet Explorer to login to the website? I have seen similar issues where with Internet Explorer the "Remain Logged in to Website." checkbox MUST be checked for the login to work properly.
Remo replied on at Permalink Reply
Remo
that shouldn't happen with 5.6.3 anymore I think.

we've had a site where the logins were broken after the update to 5.6.3 because the hashes were different. Not sure why though..