No, I can see how the way I phrased that is misleading... You can't see/hear anything, but the show is progressing in time as you're trying to unlock it. Once you get it unlocked, you've missed the first xx seconds of the show (however long it took to unlock it), and you have to rewind to the beginning again. It would be better if the show were paused (or just wouldn't start playback at all) until it was unlocked.
I've never used Parental Controls, but your wife's experience is troubling to me. Does that mean if a child selects a show s/he shouldn't see, they can see or hear part of the blocked show while attempting to guess the unlock code? I hope I'm wrong, but if so, I might consider reporting that as an issue here and in the appropriate "issues" thread for your s/w release. Just my .02. /steve
This isn't specific to any particular software version; it's been this way since day 1.