Hey guys, i just found a bug which makes the Extractor Extract Stone swords... I built a factory using buildcraft (am also running minefactory reloaded and TooManyItems)
and i attched some pictures. This is really wierd and no joke... 
Edit: I just did another test and the same effect happened but The stone swords came out as rubber. So there is obviosly a problem only when it is in Buildcraft pipes. More pics:)