Video stream won't seek past ~2400 sec using flex 3's VideoDisplay. help!

I have a video on the developer edition of FMS 3.5 that is quite large.  The total time is ~19,000 seconds.  Seeking to points prior to 2433.482 seconds work fine using VideoDisplay.playheadTime.  However if I try to set the playheadTime to any number over 2433.482 seconds, the video state is as follows:

Video state: seeking
Video state: paused
Video state: buffering
Video state: playing

and the video never reaches the point.  it just stops at 2433.482

I have messed with this for days.  I'm pretty sure it's not the flex application.  I looked through the conf file on the server but I couldn't find any variable that would be restricting it.  please help!!