Completely forgot it earlier (maybe it's not a bug, but atleast personally I don't count that as a feature): when deleting 1 entry and pressing "Yes to all" then confirmation at deletion is turned off (meaning that by next deletions the program won't ask if you're sure about it).
Perhaps a more obvious (check)button could be included to achieve this ("don't bother me anymore!" or something similar).
That's a bug ; the Yes to all is made for the cases there are multiple movies selected. There is already a checkbox "Do not ask confirmation". I'll correct this in next version. You can disable again the "do not ask option" in Preferences -> Movie list.