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I would like to apologize for any inconvenience this have caused you. There are no known issue when adding a facebook tab. Is there any error message you are receiving when you try to add a Form to your facebook page? You may, by the way, use this guide: Adding-Form-to-Facebook-Pages and/or this one Adding-Form-to-Facebook-Custom-iFrame-App- to add forms to your facebook page. For this to work, make sure you have at least one Facebook page.
You may also try to clear your browser's cache and see if it solves the issue.
Let us know if you still have the same issue after following the issue on the guides provided. Thank you.