Here's what a friend who's on the Navigator right now wrote me last night:
We skipped Cabo due to engine problems and headed directly to Acapulco. Unfortunately, the TV speed was 18 knots (which is normal for the Navigator). Cabo was only an afternoon stop and from anchor. We got a $250 shipboard credit. I think something else caused the missed port, but that’s just me since we cruised by Cabo at roughly the time we were scheduled to be there. Go figure. We were supposed to get to Acapulco early (dockside 8am) but hit head winds (i.e., waves) and now will be late, but still in the original time.

Doesn't seem too critical right now.
Jim