In 1.6.4 or above, conduits don't need to be set to an 'In' blue arrow, or an 'Out' orange arrow. In fact, it is not possible to set to an in or out arrow, as that is done automatically.
However, in 1.5.2 or below (I believe), conduits will need to be set to an 'In' or 'Out' mode. 'Out' mode...