I tell people about Gigi's all the time - super cute, neighborhood cafe with the best reuben and friendly staff. That said, both times I've ordered the reuben on gluten free bread it arrived on regular. I have celiac so this is quite a problem.
I noticed before taking a bite the first time and they remade it super fast and gave me a GF cookie for my troubles. But today, I was deep in conversation w/my friend when it arrived and I was super hungry and just ate the whole thing before realizing "hey wait, that was marble bread" and asking the guy if it was GF - ummmmm, no. They were apologetic and refunded my meal but truly, it's not acceptable. At all. And really, refunding my $15 doesn't compensate for the sickness that will be following.
So all you gluten-lovers you should totally keep going. For those that are celiac, ask and ask again and assume nothing.