No Sound output,FileStream&AudioOut

so strange,it’s suddenly stop working(didn’t do anything),the FileStream with AudioOut got no sound output at all,sayin : nil pins can not be connected in directshow graph,i did uncheck the directshow filter then recheck it,didn’t help though.
anyone ideas? do i have to manually regsvr32 those filter?
weird, the alpha28 working fine somehow

sorry about that,false alarm.i upgrade my sound-card driver & restart the computer,working now.

really sorry to bring this up. beta27.2 lost sound again.
here’s the tty message:

00:00:56 : Adding node to filtergraph: FileStream (DShow9)
00:00:56 ERR : The system cannot find the path specified.
00:01:03 : Adding node to filtergraph: FileStream (DShow9)
00:01:03 ERR : The system cannot find the path specified。
00:01:03 : Adding node to filtergraph: AudioOut (DShow9)
00:01:03 : AudioOut (DShow9).Audio --> Default DirectSound Device.Audio Input pin (rendered)
00:01:03 : Connecting from: FileStream (DShow9).Audio to: AudioOut (DShow9).Audio
00:01:03 * : nil pins can not be connected in directshow graph
00:01:03 : Removing node: Default DirectSound Device from filtergraph
00:01:03 : Adding node to filtergraph: FileStream (DShow9)
00:01:03 ERR : The system cannot find the path specified.
00:01:03 : Adding node to filtergraph: AudioOut (DShow9)
00:01:03 : Connecting from: FileStream (DShow9).Audio to: AudioOut (DShow9).Audio
00:01:03 * : nil pins can not be connected in directshow graph
00:01:16 : Removing node: Default DirectSound Device from filtergraph
00:01:16 : Adding node to filtergraph: FileStream (DShow9)
00:01:16 : FileStream (DShow9).Audio --> F:\MyCode\myVVVV\assets\Perfume_globalsite_sound.wav.Output
00:01:16 : FileStream (DShow9).Midi --> F:\MyCode\myVVVV\assets\Perfume_globalsite_sound.wav.Output
00:01:16 : FileStream (DShow9).Video --> F:\MyCode\myVVVV\assets\Perfume_globalsite_sound.wav.Output
00:01:16 : Adding node to filtergraph: AudioOut (DShow9)
00:01:16 : Connecting from: FileStream (DShow9).Audio to: AudioOut (DShow9).Audio
00:01:16 : ds connect from: Output to: Audio Input pin (rendered)
00:01:16 : FileStream (DShow9).Audio --> Wave Parser.output

any clues?