All Acol books state that you should open 1NT with a perfectly balance hand and 12- 14 points.
I have Q - Plus Bridge 10 and setting it at Standard ACOL or Intermediate and even Advanced level I put in a hand with 4 Spades 3 Hearts, 3 Diamonds and 3 clubs with 12 points and as Dealer North vulnerable the Computer passed.
In fact 3 Spades makes as South happened to have 4 spades but the computer played it as 3 diamonds E/W.
Why would Q Plus not open 1NT??