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I cannot replicate an error with the General Settings page submitting values on any of the v7.7.4 sites that I have access to.
Please attempt to submit the page then expand all of the sections on that page and look for an HTML5 error on that page; the page will not allow you to submit a page with an invalid value as of the v7.7.x series. Be sure that you expand _ALL_ sections on that page as any number of them could have the invalid value.
Example of errors attached; they will be subtle, but the page is not allowing you to submit because something on the page has an invalid value.
