are your sure about that? idk, never tried.
Just did it again. You can definitely send money to the same address you are sending from.how do you know, which of your addresses holds exactly those coins your sending?
what does your logfile say?
guess i'm gonna load a fresh install and try myself
here's another topic about flood-attacks btw, lots of questions already answered
http://bitcointalk.org/index.php?topic=287.0