Well, as usual North and East share the same side of the screen.
North/South play a Napolitan club (some sort of). They've been playing for years and evreybody sort of knows their system. So, 1 Spade is alerted as being 4 or more cards and possibly having another longer suit. After passing 2 Clubs, North alerts his pass as 'possibly' having clubs as the second suit (which, when playing canapè, which is what they play, is longer). On the other side of the screen the pass is not 'alerted'. Of course, West complains that she wouldn't have bid 3 Clubs if she had been 'alerted'; however, she did know that North had a longer suit.
So, how should the Director rule? N/S are good old players who've been playing this system for a long time, while E/W are very good players of international calibre.
The bonus question is the following:
When can a player change his/her bid when using screens? I have asked this before but I didn't quite understood the 'conclusion'. Again, something weird happened last night, this pair is bidding over a NT sequence and a player 'says' (she didn't even use the bidding box) pass to a clear cue-bid and after LHO quickly passes says, "Wait! I mean some other bid! i can change it if the tray hasn't gone to the other side!" but the truth is that the pass by her LHO ended the bidding.

Help

WestNorthEastSouth
PassPass 1♠Pass 1NT 2♣Pass*2♦ Pass3♣DoublePass Pass Pass