I have seen the sign that Elaine is talking about, kind of a 'sandwich board' type sign, but truth be told, I personally would have probably ignored it if I was going there for dinner. I'm with you, though, I blame the waiter for not telling you and then also for disappearing. We had a problem with my meal when we went there for lunch, but it was easily remedied once I brought it to their attention. But if you have a problem and no waiter to address it, then it is not possible to fix it.