However, I shot a wedding reception in relatively low light this past weekend and I had trouble both acquiring focus at times and with images that were out of focus (after focus had been confirmed).
Dig the fact that it remembers where your focus point was when you go from landscape to portrait...makes formals a breeze! Okay, it is the holy grail!!!
I'm glad you found a solution, I just wanted to make sure that you're aware of the Auto-Focus Micro-Adjustment bug, which occurs when you have your AF point linked to portrait or landscape orientation, and then the AFMA settings for your lens doesn't take affect. Since you said that you locked focus on a few shots and they were still OOF, I just wanted to make sure that you were aware of the bug.