HFS notified me there was an update.. so i pressed yes to download it. When it finished downloading, it asked me if i wanted to save my filesystem ^^
i wasn't able to reproduce this bug.
i faked an updated, and it just asked me to save with a single dialog.
i tried both yes and no as buttons.
i see an "error saving", so i also tried to fake an error, and the error message came up.
no problem at all.
i also studied the code, and found no way how could it spawn many dialogs of that kind. it is not likely to be.
let me know if you find something...