"Login with facebook" suddenly not working

When trying to log into the Page with facebook it is not working. Asking in the facebook Developer community I got informed that this has nothing to do with the “revision” requested of my API.
After you get the error message, when you try again to open the page by typing the domain name in the browser, you get redirected to domainname.com/user/login#=, it works only after cleaning history in the browser.
Here is the problem visually illustrated and can be checked even live at → windsurfing.deals
the web is made in OSCLASS and the facebook integration is a plugin, where its creator is gone fishing lol
Thank You for any help!!

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