transcoding and displaying on screen - help needed

[Harry]

Using GStreamer 1.4.5 on Windows, I'm trying to both convert and display a video.
A simplified version of my pipeline is :

gst-launch-1.0.exe
filesrc location="source.avi" ! decodebin name=d
d. ! queue ! videoconvert ! theoraenc ! queue ! tee name=vid
d. ! queue ! audioconvert ! vorbisenc ! queue ! oggmux name=mux ! filesink location="target.ogg"
vid. ! queue ! mux.
vid. ! queue ! autovideosink

Gives the errors :

0:00:00.375605447  8760   08E48280 WARN   GST_PADS gstpad.c:3739:gst_pad_peer_query:<theoraenc0:src> could not send sticky events
0:00:00.388582200  8760   0C730850 WARN   multiqueue gstmultiqueue.c:1571:gst_multi_queue_loop:<multiqueue0> error: Internal data stream error.
0:00:00.395947098  8760   0C730850 WARN   multiqueue gstmultiqueue.c:1571:gst_multi_queue_loop:<multiqueue0> error: streaming stopped, reason not-negotiated

If I delete the last line of "vid. ! queue ! autovideosink", the transcoding works correctly, but of course there is no screen display.

What am I doing wrong and how can I fix this?