FMS, VideoPlayer and application instances

I am trying to playback recorded  streams from a Flash Media Interactive Server using the VideoPlayer  component in Flex  4/Flash Builder 4.

If the stream is located in the  <serverpath>/streams/vod/_definst_ directory then I can get to it  by setting the 'source' parameter of the VideoPlayer to  "<server>/vod/streamname" assuming streamname is an .flv file.  If  the stream is located in an application directory (e.g. 'app1') in the  _definst_ directory (i.e. <serverpath>/app1/streams/_definst_),  then I can successfully play it back by setting the 'source' parameter  to "<server>/app1/streamname".

What I can't get to work is when I  have a stream recorded to an instance within an application directory.   So if the application is "app1' and the instance name is "inst1" it  would be literally located in <serverpath>/app1/streams/inst1  directory.  Setting the source parameter to this  "<server>/app1/inst1/streamname" does not work.  It seams to be  ignoring the 'inst1' part of the path because the server side log shows  '_definst_' as the instance name being run.

I know this is in part a Flex 4 question, but manually writing a video player works.  I  would just like to get the Flex 4 VideoPlayer component to play the  video.

Thanks  for any help.