abrt version: 1.1.18
architecture: i686
cmdline: python /usr/bin/pitivi
component: pitivi
executable: /usr/bin/pitivi
kernel: 2.6.35.13-92.fc14.i686.PAE
package: pitivi-0.14.0-2.fc14
reason: base.py:682:makeBin:ObjectFactoryError: unknown stream
release: Fedora release 14 (Laughlin)
time: 1311992807
uid: 500

backtrace
-----
base.py:682:makeBin:ObjectFactoryError: unknown stream

Traceback (most recent call last):
  File "/usr/share/pitivi/python/pitivi/ui/timeline.py", line 430, in _dragMotionCb
    self._add_temp_source()
  File "/usr/share/pitivi/python/pitivi/ui/timeline.py", line 527, in _add_temp_source
    for factory in self._factories]
  File "/usr/share/pitivi/python/pitivi/timeline/timeline.py", line 1695, in addSourceFactory
    track.addTrackObject(track_object)
  File "/usr/share/pitivi/python/pitivi/timeline/track.py", line 1152, in addTrackObject
    track_object.makeBin()
  File "/usr/share/pitivi/python/pitivi/timeline/track.py", line 657, in makeBin
    bin = self.factory.makeBin(self.stream)
  File "/usr/share/pitivi/python/pitivi/factories/base.py", line 682, in makeBin
    raise ObjectFactoryError('unknown stream')
ObjectFactoryError: unknown stream

Local variables in innermost frame:
self: <pitivi.factories.operation.EffectFactory object at 0xa96fd6c>
input_stream: <pitivi.stream.VideoStream object at 0xa97224c>
output_stream: None

How to reproduce
-----
1. dragging media from library to timeline.
2.
3.