FLV files exported with Alpha have extra frames after end of sequence.

Sequence is 588w x 486h Animation+ codec, talent chroma-key (Conduit) on track 2 with no background on track 1. Flash 8 is installed. When I export using the QuickTime Flash export component using On2 VP6 with Alpha Channel settings, the resulting FLV has additional frames up to around 20 seconds for a 2 minute sequence. These additional frames are a freeze of the last frame in the sequence. I tried several different sequence codecs/Spark codec with same result. Even setting an In and Out on the sequence does not help.
One symptom I have noticed, is that when I click in the timeline beyond the last frame of video, I still see the last frame of video in the Canvas (But not in the BlackMagic video card output). Normally I would see black or checkerboard.
Anybody heard of any conflicts with the Flash Export component dircect from the timeline or via a batch export.
Exporting an Item Settings QuickTime (Animation+) files and then using Flash Encoder does work, but I am trying to avoid the extra steps. (250 sequences to export)
I suspect I have an issue with the export component, but I wanted to see if anybody else has experiences this before I reinstall FCP and Flash software.

I have found what I believe the cause of the extra frames issue here, so I thought I would post it for others.
This appears to be caused by a problem between the Adobe FLV Export Component and QuickTime 7.2.  Adobe's website says that Flash encoder has issues with non 44.1 kHz audio.  Changing the sequence settings to 44.1 and rendering the audio solves the problem and FLV files exported from the timeline or via batch export are the correct length.
Exporting FLV files using either Spark or On2 VP6 with alpha, used to be a breeze with awesome results.  I do this all day to support our Flash developers.  The audio issue is easy to work around, but I also get random errors in the alpha channel of these movies now.  These single frame errors appear as black flashes.  There is nothing in the timeline that would appear to cause this.  Re-exporting sometimes fixes it, or simply moves the error somewhere else in the timeline.    This may also be related to QuickTime 7.2, but I don't know.
If anyone has experience these flashes in the alpha channel of exported FLV files please let me know how you resolved it.  This is a major productivity killer.
Thanks....

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