This is not a serious issue but a small visual one. - just thought I would mention it though.
After you use the scissors tool on a midi track the dash marks that represent midi notes seem to change their position in vertical height on the midi track. At first my fear was that some sort of transposition was going on but after soloing and listening this is not the case. It is visually a little disconcerting when before you use the scissors tool on the track that displays stepwise motion suddenly appears to leap down an ocatve.
I don’t recall this kind of behaviour in Cubase 5.5