10.6.8: audio goes out of sync in Netflix streaming and *.avi files

Hello,
This began happening a couple of weeks ago and it's maddening! There haven't been any software changes or anything recently.
At first I thought it was just a Netflix problem, or perhaps an internet connection problem. Audio will at some point during play, 'skip', and play the same audio over again (i.e., "Hello, Ja-Hello, Jack!"), and from that point on, the audio is lagged behind the video just a bit.
Then I began watching some *.avi files on my HDD today, and the same thing is happening with them, too! If I reload the browser or close and reopen the *.avi file, the audio will start out in sync again, but at some random point during playback, it will happen again.
Hope someone knows what's going on! Thanks!
Mid-2010 Macbook Pro 10.6.8

For anyone who's interested, I found a solution to this problem. Once imported into Encore, the leader in on the video and audio files cannot be trimmed at all. (I had been trimming the beginning of the video and matching audio file to eliminate the 8 seconds of dead space at the start of the clips.) Although the trim took effect immediately in the Encore timeline and I could also watch it in preview in sync, exporting was another story. The audio track seems to retain the trim when exporting but the video track does not, hence the 6-7 second delay between audio and video.
I reimported the files to my project and left in the 8 seconds of dead space at the start and voila! The video and audio match up when exported.
Ideally the trim tool would just work as its supposed to through export and all, but at least I found a solution I can work with.
(As a note, the trim works just fine in export on Encore CS5. I only had this problem with Encore CS6.)

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Question ONE
I checked my Easy Setup settings again, and the format is shown as "custom." I'm sure I didn't select this intentionally; I selected DV-NTSC. Not sure if this "custom" setting is why things are working now. Any idea why this setting might have changed to "custom" automatically by FCE?
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Question TWO
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10.6.8: audio goes out of sync in Netflix streaming and *.avi files

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