Description of problem:
Pitivi crashes when I try to drag a DV clip to the timeline. The following error
is printed:

/usr/share/pitivi/python/pitivi/pitivi.py:158: GtkWarning:
gtk_text_layout_get_iter_at_position: assertion `GTK_IS_TEXT_LAYOUT (layout)' failed
  gtk.main()
/usr/share/pitivi/python/pitivi/pitivi.py:158: GtkWarning: Invalid text buffer
iterator: either the iterator is uninitialized, or the
characters/pixbufs/widgets in the buffer have been modified since the iterator
was created.
You must use marks, character numbers, or line numbers to preserve a position
across buffer modifications.
You can apply tags and insert marks without invalidating your iterators,
but any mutation that affects 'indexable' buffer contents (contents that can be
referred to by character offset)
will invalidate all outstanding iterators
  gtk.main()
Segmentation fault

Version-Release number of selected component (if applicable):
pitivi-0.10.3-2.fc8

How reproducible:
Every time

Steps to Reproduce:
1. Import a raw DV clip into pitivi
2. Drag the clip and drop it onto the timeline
  
Actual results:
Pitivi crashes with the error message above.

Expected results:
The clip should be placed on the timeline.

Additional info:
I built a local copy of pitivi version 0.11.0. This version does not have this
problem.