I made a question yesterday, and someone did answer something, I remember i asked for more information in the comments, but today I checked again and the user deleted the answer. Wich makes me feel like i'm crazy or something, but no, i'm sure he (or she) actually did answer my question.
There should be something like a record for the questions you ask. Something like a history, or a log where you can check if this kind of things actually happened.
of course, it should be visible only for the author of the question, not for everyone. I think in most of cases it would turn out to be useful
I don't know if this feature already exists, but i couldn't find it. Thanks for your help, despite this may be more of a suggestion for the site