Same issue, latest WordPress, latest plugin. All other emails go out, just not to admin on new user registration.
Actually, thinking about it, I can make my own faq-page-template where I put the short code, that can fix the author part. Will your css overwrite if I put it in my child template css file?
I have been looking for the same. The only one I can find out there is this one: http://thedeadone.net/download/tdo-mini-forms-wordpress-plugin/
but it does not work for me and the tech support is nil. The forum has a ton of messages without replies …