I went to the "Basic Settings" tab, removed the URL (below "Security key") and tried clicking "Update settings". That worked fine.
If I click "Update settings" when on "Options" tab, I get the 403 error.
If I try to add the URL again, I get a 403 error, but when I click back, the value has been saved and now I have an error msg below the URL: "Status: The check returned an error where no valid headers where returned. Please try the iframe manually. Details about the error: Error code: 3. Error message: malformed. If you like more details about the error please see here." I did not click the "Check all iframes" button.
I updated from v.5.7.5 if I remember correctly.
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