Exported Audio out of sync on one clip only - everything else is fine.

Hi all,
I am under a deadline and really appreciate any help on this. I've been working in 30 fps, Apple Prores 422. I've been outputting various cuts of a documentary. I had no issues at all until this morning.
One series of clips at the end of one sequence is now quite mysteriously out of sync. When I play in FCP there are no issues. Only when I output, and only in one small section of one sequence.
Again, this sequence gave me no issues for months. Just today.
The whole film is fine when outputted. It's just that one series of clips is out of sync by about a second. And in FCP there is no sync problem or delay.
Thanks!!

Hi there,
The clips in the sequence are from different source tapes. Other clips from the same source tape work correctly. Everything in my documentary is Apple Prores 422, same settings across the board. I did a massive convert of all the footage I am working with before I started the project.
I "solved" the issue by starting a new sequence at the point where the audio went funky. That sequence, which has the same settings as all my others works fine and nests into the final output sequence just fine. But I still don't know what happened.
Any thoughts? Since the issue is somewhat resolved (via this workaround) I don't want to take any of your time. But I am curious...
Thanks,
Sanjay

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============================================================
General
Complete name                    : /Users/jukeboxhero/20140203.mov
Format                           : MPEG-4
Format profile                   : QuickTime
Codec ID                         : qt
File size                        : 638 MiB
Duration                         : 34mn 46s
Overall bit rate                 : 2 566 Kbps
Encoded date                     : UTC 2014-02-04 06:52:45
Tagged date                      : UTC 2014-02-06 15:55:40
Writing library                  : Apple QuickTime
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ID                               : 2
Format                           : AVC
Format/Info                      : Advanced Video Codec
Format profile                   : [email protected]
Format settings, CABAC           : No
Format settings, ReFrames        : 2 frames
Format settings, GOP             : M=2, N=30
Codec ID                         : avc1
Codec ID/Info                    : Advanced Video Coding
Duration                         : 34mn 46s
Bit rate mode                    : Variable
Bit rate                         : 2 449 Kbps
Width                            : 1 920 pixels
Height                           : 1 080 pixels
Display aspect ratio             : 16:9
Frame rate mode                  : Variable
Frame rate                       : 18.969 fps
Minimum frame rate               : 6.522 fps
Maximum frame rate               : 19.355 fps
Color space                      : YUV
Chroma subsampling               : 4:2:0
Bit depth                        : 8 bits
Scan type                        : Progressive
Bits/(Pixel*Frame)               : 0.062
Stream size                      : 609 MiB (95%)
Language                         : English
Encoded date                     : UTC 2014-02-04 06:52:46
Tagged date                      : UTC 2014-02-04 15:27:35
Color primaries                  : BT.709-5, BT.1361, IEC 61966-2-4, SMPTE RP177
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ID                               : 1
Format                           : AAC
Format/Info                      : Advanced Audio Codec
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Codec ID                         : 40
Duration                         : 34mn 45s
Bit rate mode                    : Constant
Bit rate                         : 104 Kbps
Nominal bit rate                 : 128 Kbps
Channel(s)                       : 2 channels
Channel positions                : Front: L R
Sampling rate                    : 44.1 KHz
Compression mode                 : Lossy
Stream size                      : 25.9 MiB (4%)
Language                         : English
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Tagged date                      : UTC 2014-02-04 15:27:35
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Exported Audio out of sync on one clip only - everything else is fine.

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